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LO Vet Tech practice questions

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Question 1Veterinary Medical Terminology and Anatomy

Which directional term describes a structure located nearer to the tail or rear of the body?

  1. Rostral
  2. Caudal Correct answer.
  3. Cranial
  4. Ventral

Explanation

Caudal means toward the tail (or toward the rear in humans), and it is the standard opposite of cranial. Rostral is used mainly in the head region to mean toward the nose, and ventral means toward the belly.

Question 2Veterinary Medical Terminology and Anatomy

The term 'dorsal' refers to which surface of the animal?

  1. The surface facing the tail
  2. The belly-facing surface
  3. The back or upper surface Correct answer.
  4. The side closest to the midline

Explanation

Dorsal means toward the back or upper surface, and in quadrupeds it corresponds to the spine side of the body. Its opposite is ventral, which refers to the belly-facing surface.

Question 3Veterinary Medical Terminology and Anatomy

Which term means 'toward the midline' of the body?

  1. Lateral
  2. Medial Correct answer.
  3. Distal
  4. Proximal

Explanation

Medial describes a position closer to the median plane, the midline dividing the body into left and right halves. Lateral is the opposite, while proximal and distal describe distance along a limb relative to the body.

Question 4Veterinary Medical Terminology and Anatomy

The combining form 'osteo-' in veterinary terms such as osteoarthritis refers to which structure?

  1. Joint
  2. Cartilage
  3. Muscle
  4. Bone Correct answer.

Explanation

The combining form osteo- comes from the Greek word for bone, so osteoarthritis literally denotes inflammation involving bone and joint. Muscle is myo-, joint is arthro-, and cartilage is chondro-.

Question 5Veterinary Medical Terminology and Anatomy

In the term 'gastritis', the suffix '-itis' indicates which process?

  1. Pain
  2. Surgical removal
  3. Inflammation Correct answer.
  4. Abnormal enlargement

Explanation

The suffix -itis means inflammation, so gastritis is inflammation of the stomach. Surgical removal is -ectomy, enlargement is -megaly, and pain is -algia.

Question 6Veterinary Medical Terminology and Anatomy

Which prefix means 'before' or 'in front of', as in the term prenatal?

  1. Post-
  2. Pro-
  3. Pre- Correct answer.
  4. Peri-

Explanation

The prefix pre- means before or in front of, so prenatal refers to the period before birth. Post- means after, peri- means around, and pro- means before in the sense of forward or preceding in a different usage.

Question 7Veterinary Medical Terminology and Anatomy

Which of the following describes the anatomical position used as the reference for directional terms in quadrupeds?

  1. Standing squarely on all four limbs with the head facing forward Correct answer.
  2. Sitting with the hindlimbs flexed
  3. Recumbent with the limbs extended
  4. Standing with the head turned to the left

Explanation

The standard anatomical position for a quadruped is standing squarely on all four limbs with the head and body aligned forward. All directional terms are referenced to this neutral standing posture, not to a recumbent or sitting position.

Question 8Veterinary Medical Terminology and Anatomy

Which body cavity is separated from the thoracic cavity by the diaphragm?

  1. Spinal canal
  2. Cranial cavity
  3. Abdominal cavity Correct answer.
  4. Pelvic cavity

Explanation

The diaphragm separates the thoracic cavity from the abdominal cavity, which lies caudal to it. The pelvic cavity is a continuation of the abdominal cavity within the pelvis, and the cranial cavity houses the brain.

Question 9Veterinary Medical Terminology and Anatomy

A dog is described as being in 'sternal recumbency'. Which description matches this term?

  1. Standing with weight shifted to the forelimbs
  2. Lying on its chest and belly Correct answer.
  3. Lying on its side
  4. Lying on its back

Explanation

Sternal recumbency means the animal is lying with its sternum and ventral chest against the table, so it is resting on its chest and belly. Lying on the side is lateral recumbency, and lying on the back is dorsal recumbency.

Question 10Veterinary Medical Terminology and Anatomy

A technician records that a mass is on the 'cranial aspect of the left antebrachium'. Where is the mass located?

  1. On the outer surface of the left upper arm
  2. On the inner surface of the left thigh
  3. On the back of the left forearm, nearer the wrist
  4. On the front of the left forearm Correct answer.

Explanation

The antebrachium is the region between the elbow and the carpus, commonly called the forearm. Cranial refers to the front-facing surface, so the mass lies on the front of the left forearm. The description does not specify whether it is nearer the elbow or wrist.

Question 11Veterinary Medical Terminology and Anatomy

Which term correctly describes the position of the carpus relative to the elbow in the thoracic limb?

  1. The carpus is distal to the elbow Correct answer.
  2. The carpus is medial to the elbow
  3. The carpus is dorsal to the elbow
  4. The carpus is proximal to the elbow

Explanation

Proximal and distal describe position along a limb relative to its attachment to the trunk. The carpus lies farther from the trunk than the elbow, so it is distal to the elbow.

Question 12Veterinary Medical Terminology and Anatomy

The term 'polydactyly' describes which condition?

  1. Absence of one or more digits
  2. Presence of more than the normal number of digits Correct answer.
  3. Fusion of two adjacent digits
  4. Abnormal shortening of the digits

Explanation

The prefix poly- means many, and -dactyly refers to digits, so polydactyly is the presence of extra digits. Absence of digits is adactyly or oligodactyly, and fusion is syndactyly.

Question 13Veterinary Medical Terminology and Anatomy

A record states that a lesion is 'subcutaneous'. Which layer does this describe?

  1. Within the epidermis
  2. Beneath the skin, in the tissue under the dermis Correct answer.
  3. Inside a joint capsule
  4. Within the spinal cord

Explanation

The prefix sub- means under or below, and cutaneous refers to the skin, so subcutaneous means beneath the skin in the layer under the dermis. It does not refer to a structure inside the skin itself or within a joint.

Question 14Veterinary Medical Terminology and Anatomy

Which term describes an animal that is unable to breathe normally because of difficulty with respiration?

  1. Dyspnea Correct answer.
  2. Dysuria
  3. Dyschezia
  4. Dysphagia

Explanation

The prefix dys- means difficult or painful, and -pnea refers to breathing, so dyspnea is difficult or labored breathing. Dysphagia refers to swallowing, dysuria to urination, and dyschezia to defecation.

Question 15Veterinary Medical Terminology and Anatomy

In a term such as 'hepatomegaly', the suffix indicates which finding?

  1. Removal of the liver
  2. Enlargement of the liver Correct answer.
  3. Inflammation of the liver
  4. Tumor of the liver

Explanation

The suffix -megaly means enlargement, so hepatomegaly is enlargement of the liver. Inflammation would be hepatitis, surgical removal would be hepatectomy, and a tumor would be described as a hepatic neoplasm.

Question 16Veterinary Medical Terminology and Anatomy

Which plane divides the body into left and right portions?

  1. Dorsal plane
  2. Transverse plane
  3. Median plane Correct answer.
  4. Frontal plane

Explanation

The median plane is a sagittal plane that passes through the midline and divides the body into left and right halves. The transverse plane divides the body into cranial and caudal portions, and the dorsal plane divides it into dorsal and ventral portions.

Question 17Veterinary Medical Terminology and Anatomy

Which of the following correctly pairs a combining form with its meaning?

  1. Hepato- means kidney
  2. Cardio- means heart Correct answer.
  3. Nephro- means nerve
  4. Pneumo- means stomach

Explanation

Cardio- refers to the heart, as in cardiomegaly. Nephro- refers to the kidney, hepato- to the liver, and pneumo- to the lung or air.

Question 18Veterinary Medical Terminology and Anatomy

A veterinary technician notes 'cranial cruciate ligament rupture' in a dog. Which structure is affected?

  1. A ligament in the elbow that stabilizes the olecranon
  2. A ligament in the carpus that supports the accessory carpal bone
  3. A ligament in the hip that holds the femoral head in the acetabulum
  4. A ligament in the stifle joint that limits cranial displacement of the tibia Correct answer.

Explanation

The cranial cruciate ligament lies within the stifle joint and restrains cranial displacement of the tibia relative to the femur. It is a key stabilizer of the knee in dogs and is a common site of rupture.

Question 19Veterinary Medical Terminology and Anatomy

A term describing a structure as 'superficial' means it is located in which position?

  1. Toward the midline
  2. Toward the tail
  3. Closer to the center of the body
  4. Closer to the body surface Correct answer.

Explanation

Superficial describes a structure nearer the body surface, and its opposite is deep, meaning farther from the surface. It should not be confused with medial, which refers to the midline, or caudal, which refers to the tail direction.

Question 20Veterinary Medical Terminology and Anatomy

A prefix meaning 'around' appears in which of the following terms?

  1. Epicardium
  2. Pericardium Correct answer.
  3. Endocardium
  4. Myocardium

Explanation

The prefix peri- means around, so the pericardium is the sac surrounding the heart. Endo- means within, myo- refers to muscle, and epi- means upon or over.

Question 21Veterinary Medical Terminology and Anatomy

A dog is positioned in dorsal recumbency for radiography. Which surface of the body is in contact with the table?

  1. The left side
  2. The pelvic region only
  3. The sternum
  4. The dorsal midline of the back Correct answer.

Explanation

Dorsal recumbency means the animal lies on its back, so the dorsal midline, including the vertebral column, contacts the table. Sternal recumbency places the sternum down, and lateral recumbency places one side down.

Question 22Veterinary Medical Terminology and Anatomy

Which statement best distinguishes 'proximal' from 'cranial'?

  1. Proximal refers to the midline, while cranial refers to the tail
  2. Proximal refers to position along a limb relative to the trunk, while cranial refers to position toward the head Correct answer.
  3. Proximal and cranial are synonyms when describing limb structures
  4. Proximal refers to the body surface, while cranial refers to deeper structures

Explanation

Proximal describes a structure nearer the point of limb attachment to the trunk, and distal is its opposite. Cranial describes a position toward the head along the body axis, so the two terms answer different questions and are not interchangeable.

Question 23Veterinary Medical Terminology and Anatomy

An animal is described as having 'caudoventral' displacement of a structure. Which direction does this describe?

  1. Toward the tail and belly Correct answer.
  2. Toward the tail and back
  3. Toward the head and belly
  4. Toward the head and back

Explanation

Compound directional terms combine two axes: caudo- means toward the tail and ventral means toward the belly. Therefore caudoventral indicates a position that is both caudal and ventral relative to a reference point.

Question 24Veterinary Medical Terminology and Anatomy

Which term correctly describes the relationship of the radius to the ulna in the standard anatomical position of a dog's thoracic limb?

  1. The radius is caudal and medial to the ulna throughout the antebrachium
  2. The radius is proximal to the ulna
  3. The radius lies principally cranial to the ulna, with their medial-lateral relationship changing along the antebrachium Correct answer.
  4. The radius lies dorsal to the carpus

Explanation

In the dog's antebrachium, the radius lies principally cranial to the ulna. The bones cross obliquely, so their medial-lateral relationship changes between the elbow and carpus. Both occupy the forearm segment; describing the radius as simply proximal to the ulna is inaccurate.

Question 25Animal Restraint and Handling

A veterinary technician needs to lift a medium-sized, calm dog from the floor onto an exam table. Which technique best protects both the technician and the patient?

  1. Grasp the dog by the scruff and lift quickly
  2. Lift the dog by the front legs only
  3. Wrap one arm under the chest and one under the hindquarters, keeping the back straight Correct answer.
  4. Hold the dog by the collar and pull upward

Explanation

Supporting both the thorax and the pelvis distributes the animal's weight and prevents spinal strain, while keeping the back straight and lifting with the legs protects the technician's spine. Lifting by a single body part concentrates force and risks injury to both parties.

Question 26Animal Restraint and Handling

Which restraint device is designed to prevent a dog from licking or biting at a wound on its forelimb while still allowing it to eat and drink?

  1. Muzzle
  2. Elizabethan collar Correct answer.
  3. Head halter
  4. Basket muzzle

Explanation

An Elizabethan collar creates a physical barrier around the head that stops the patient reaching a wound with its mouth while leaving the mouth free for eating and drinking. Muzzles and halters restrict the mouth or control the head but do not block access to body wounds.

Question 27Animal Restraint and Handling

What is the primary purpose of a cat bag or restraint bag during venipuncture in a fractious cat?

  1. To measure the cat's body temperature
  2. To prevent the cat from vocalizing
  3. To sedate the cat chemically
  4. To immobilize the body and limbs while allowing access to a vein Correct answer.

Explanation

A restraint bag confines the trunk and limbs so the handler can expose a single limb for venipuncture while minimizing struggle and injury risk. It provides mechanical, not chemical, control and does not alter temperature or vocalization.

Question 28Animal Restraint and Handling

When applying a gauze muzzle to a dog, where should the first loop be placed?

  1. Over the eyes
  2. Around the neck only
  3. Over the ears
  4. Around the upper muzzle just behind the nose Correct answer.

Explanation

The first loop of a gauze muzzle sits over the top of the muzzle just behind the nose, with the ends crossed underneath and brought back to tie behind the ears. This position holds the mouth closed without obstructing the eyes or airway.

Question 29Animal Restraint and Handling

Which body region should be avoided when grasping a rabbit for routine handling?

  1. The thorax
  2. The scruff
  3. The hindquarters
  4. The ears Correct answer.

Explanation

Rabbits must never be lifted by the ears because the delicate cartilage and vessels can be permanently damaged and the animal is left unsupported. Handlers scruff the loose skin over the neck and always support the hindquarters and thorax.

Question 30Animal Restraint and Handling

A technician must restrain a horse for a brief physical examination. Which method provides the safest basic control?

  1. Tying the horse tightly to a ring and working alone
  2. A twitch applied before the horse is haltered
  3. A halter and lead held by an experienced handler standing at the horse's shoulder Correct answer.
  4. Standing directly in front of the horse's face

Explanation

A properly fitted halter with a lead held by a handler positioned at the shoulder gives controlled, safe restraint and keeps the handler out of the kick zone. Twitches are applied after haltering and only for brief procedures, and standing in front of the face blocks the animal's vision.

Question 31Animal Restraint and Handling

During restraint of a dog for a cephalic venipuncture, the holder places one arm under the dog's neck and the other around the hindquarters. What is the main advantage of this position?

  1. It prevents the dog from breathing
  2. It allows the dog to move its head freely
  3. It makes the dog fall asleep
  4. It supports the body while keeping the head controlled and the forelimb accessible Correct answer.

Explanation

Cradling the neck with one arm and supporting the hindquarters with the other stabilizes the trunk and controls the head while leaving the forelimb exposed for venipuncture. This reduces sudden movement and protects the holder from injury.

Question 32Animal Restraint and Handling

A cat is being restrained in lateral recumbency for a blood draw from the medial saphenous vein. Which handler action is most appropriate?

  1. Stretching all four limbs outward
  2. Pulling the tail firmly downward
  3. Pressing the cat's head firmly to the table
  4. Holding the scruff and supporting the hindlimb with the vein exposed Correct answer.

Explanation

Scruffing plus gentle support of the hindlimb exposes the medial saphenous vein while keeping the cat controlled and minimizing struggle. Stretching limbs or pressing the head increases stress and injury risk, and the tail must never be pulled.

Question 33Animal Restraint and Handling

A technician needs to place a dog in sternal recumbency for a radiograph. Which approach minimizes stress and injury?

  1. Use a catch pole to force the dog down
  2. Roll the dog abruptly onto its chest from standing
  3. Lift the dog by the hindlimbs and drop it into position
  4. Guide the dog down gently with one hand under the chest and one under the abdomen Correct answer.

Explanation

Gently guiding the dog down while supporting the chest and abdomen keeps the animal calm and prevents falls or spinal twisting. Abrupt rolling, lifting by the limbs, or forceful tools increase stress and injury risk.

Question 34Animal Restraint and Handling

Which sign in a restrained dog most reliably indicates that restraint should be paused or adjusted?

  1. The dog is wagging its tail slowly
  2. The dog is panting quietly with a relaxed face
  3. The dog is stiffening, staring, and showing whale eye Correct answer.
  4. The dog is licking its lips occasionally

Explanation

Stiffening, a hard stare, and whale eye (sclera visible) are classic fear or aggression signals that precede a bite and indicate restraint should be reassessed. Relaxed panting and slow tail wagging generally suggest lower stress, though all body language must be read as a whole.

Question 35Animal Restraint and Handling

A technician is asked to restrain a bird for a physical exam. Which handling approach is correct?

  1. Grasp the body with the wings folded against the trunk and support the feet Correct answer.
  2. Squeeze the thorax firmly to prevent breathing
  3. Hold the bird by the tail feathers
  4. Hold the bird upside down by one leg

Explanation

Birds are restrained by holding the body with the wings folded against the trunk while supporting the feet, which prevents wing flapping and injury. Squeezing the thorax restricts breathing and holding by a limb or the tail risks fractures and feather loss.

Question 36Animal Restraint and Handling

A large, fearful dog in the lobby is barking and backing away. What is the best first step before any hands-on restraint?

  1. Have two staff members pin the dog to the floor
  2. Use a catch pole immediately
  3. Approach quickly and place a muzzle
  4. Reduce stressors, allow the dog space, and use low-stress handling techniques Correct answer.

Explanation

Low-stress handling begins by reducing environmental stressors, giving the animal space, and using calm approach and treats or barriers before physical restraint. Rushing in or using forceful tools escalates fear and bite risk.

Question 37Animal Restraint and Handling

When using a chemical restraint protocol for a fractious cat, what is the technician's responsibility regarding monitoring?

  1. Monitor respiration, mucous membrane color, and temperature until recovery Correct answer.
  2. Discontinue monitoring once the cat stops moving
  3. Administer additional doses without veterinary direction
  4. Leave the cat unattended once sedated

Explanation

Sedated patients require continuous monitoring of respiration, mucous membrane color, and temperature because anesthetic and sedative agents depress protective reflexes and thermoregulation. Unattended or unmonitored recovery risks hypothermia, respiratory depression, and aspiration.

Question 38Animal Restraint and Handling

A horse is being restrained with a lip twitch for a brief procedure. Which statement best describes correct twitch use?

  1. The twitch should be applied and left on for the entire appointment
  2. The twitch replaces the need for a halter
  3. The twitch should be applied by an experienced handler and released promptly after the brief procedure Correct answer.
  4. The twitch should be applied to the ear for stronger effect

Explanation

A lip twitch provides short-term restraint and should be applied by a knowledgeable handler and released promptly once the brief procedure ends to avoid tissue damage and habituation. It is an adjunct to, not a replacement for, halter control, and ear twitching is not a standard humane technique.

Question 39Animal Restraint and Handling

A technician is restraining a pig for a blood draw. Which method is most appropriate?

  1. Hold the pig by a single hindlimb
  2. Use a snare around the upper jaw and lift
  3. Lift the pig by the ears
  4. Use a pig snout snare or snare board to control the head while supporting the body Correct answer.

Explanation

Pigs are controlled with a snare around the upper jaw or a snare board, which guides the head while the body is supported, allowing safe access for venipuncture. Lifting by the ears or a single limb causes injury and does not control the animal.

Question 40Animal Restraint and Handling

A technician is asked to obtain a blood sample from the jugular vein of a healthy, calm horse. Which restraint plan is most appropriate?

  1. A blindfold applied without haltering
  2. A lip twitch applied before the halter is on
  3. Halter and lead held by a handler on the same side as the technician, with the horse's head turned slightly away Correct answer.
  4. The horse tied short to a wall and left alone

Explanation

For jugular venipuncture, a halter and lead held by a handler positioned on the same side as the technician keeps the horse controlled and the handler out of the kick zone, with the head turned slightly away to expose the vein. Blindfolds, short ties, and premature twitches increase risk without improving control.

Question 41Animal Restraint and Handling

A dog with a known history of fear-based aggression needs a nail trim. Which combination best reflects a low-stress, safety-first plan?

  1. Immediate catch-pole capture and forced restraint
  2. Full-body pin restraint with no pre-visit planning
  3. Pre-visit anxiolytic protocol per veterinarian, muzzle training, and minimal restraint with frequent breaks Correct answer.
  4. Four-person manual restraint with no sedation

Explanation

A fear-aggressive dog benefits from a pre-visit anxiolytic plan prescribed by the veterinarian, prior muzzle training, and minimal handling with breaks, which lowers arousal and bite risk. Forced restraint or capture tools escalate fear and endanger staff.

Question 42Animal Restraint and Handling

During restraint of a cat for a jugular venipuncture, the holder notes the cat's mucous membranes becoming pale and the cat struggling less. What is the most appropriate interpretation and action?

  1. The cat is asleep, so finish quickly
  2. The cat is being cooperative, so tighten restraint
  3. Pallor and reduced struggle may indicate cardiovascular compromise; pause, reassess, and inform the veterinarian Correct answer.
  4. The cat is relaxing, so continue the procedure

Explanation

Pale mucous membranes combined with reduced struggling can signal poor perfusion or impending collapse rather than relaxation, so the procedure should be paused, the patient reassessed, and the veterinarian informed. Tightening restraint or continuing would worsen the situation.

Question 43Animal Restraint and Handling

A technician must move a recumbent, anesthetized large dog from the floor to a treatment table. Which principle best guides the lift?

  1. Lift with the back bent and twist at the waist
  2. Use a team lift with the load close to the body, back straight, and knees bent Correct answer.
  3. Lift alone to save time
  4. Drag the dog by the forelimbs

Explanation

A team lift with the load close to the body, a straight back, and bent knees distributes weight and protects the technician's spine. Bending and twisting, lifting alone, or dragging the patient all increase injury risk to staff and the animal.

Question 44Animal Restraint and Handling

Which statement accurately describes the role of a head halter in canine restraint?

  1. It is appropriate only for cats
  2. It provides control of the head and direction of movement but does not prevent biting Correct answer.
  3. It replaces the need for a leash
  4. It physically closes the mouth like a muzzle

Explanation

A head halter controls the head and guides movement, which is useful for handling strong or reactive dogs, but it leaves the mouth free and therefore does not prevent biting. It is used with a leash and is designed for dogs, not cats.

Question 45Pharmacy and Pharmacology

A veterinary technician is preparing to administer a drug by the intravenous route. Which property must a formulation have to be safe for IV injection?

  1. It must be formulated as an oil-in-water emulsion to slow absorption
  2. It must be a sterile solution free of particulates and preservatives toxic to endothelium Correct answer.
  3. It must be a suspension with particles small enough to pass a 25-gauge needle
  4. It must contain a preservative to prevent microbial growth after the vial is opened

Explanation

Intravenous administration bypasses all absorption barriers and protective filters, so the product must be sterile, clear of particulate matter, and free of preservatives or solvents that are irritating or toxic to blood and endothelium. Suspensions, oils, and many preservatives are acceptable by other routes but can cause embolic or hemolytic reactions if injected into a vein.

Question 46Pharmacy and Pharmacology

Which term describes the fraction of an administered dose of a drug that reaches the systemic circulation unchanged?

  1. Volume of distribution
  2. Clearance
  3. Half-life
  4. Bioavailability Correct answer.

Explanation

Bioavailability expresses the proportion of a dose that enters systemic circulation in an active form, and it is 100 percent by definition for an intravenous dose. Half-life, volume of distribution, and clearance are separate pharmacokinetic parameters that describe elimination and distribution rather than the extent of absorption.

Question 47Pharmacy and Pharmacology

A drug that binds to a receptor and produces a maximal response equal to that of the endogenous ligand is best described as which of the following?

  1. A full agonist Correct answer.
  2. A partial agonist
  3. An inverse agonist
  4. A competitive antagonist

Explanation

A full agonist has both high receptor affinity and full intrinsic activity, so it can elicit the same maximal effect as the natural ligand. Partial agonists produce submaximal responses, antagonists block without activating, and inverse agonists reduce constitutive activity.

Question 48Pharmacy and Pharmacology

Which class of antimicrobial drug acts by inhibiting bacterial cell wall synthesis?

  1. Fluoroquinolones
  2. Aminoglycosides
  3. Beta-lactams Correct answer.
  4. Tetracyclines

Explanation

Beta-lactam antibiotics such as penicillins and cephalosporins acylate penicillin-binding proteins and block peptidoglycan cross-linking, weakening the cell wall. Aminoglycosides and tetracyclines inhibit protein synthesis, and fluoroquinolones inhibit DNA gyrase.

Question 49Pharmacy and Pharmacology

A veterinarian prescribes a drug at 5 mg/kg and the patient weighs 12 kg. What total dose should the technician prepare?

  1. 60 mg Correct answer.
  2. 30 mg
  3. 120 mg
  4. 17 mg

Explanation

The dose is calculated by multiplying the dose rate by body weight: 5 mg/kg times 12 kg equals 60 mg. Checking the units confirms that kilograms cancel and the answer is expressed in milligrams.

Question 50Pharmacy and Pharmacology

Which route of administration typically produces the most rapid onset of systemic effect in a collapsed patient?

  1. Subcutaneous
  2. Oral
  3. Intramuscular
  4. Intravenous Correct answer.

Explanation

Intravenous administration places the drug directly into the bloodstream, bypassing absorption and giving the fastest systemic onset, which is why it is preferred in emergency or collapsed patients. Subcutaneous and intramuscular routes depend on absorption from tissue, and oral administration also requires gastrointestinal absorption and may be unreliable in a compromised patient.