CLT8 case studies
CLT8 · Put your knowledge to work in context.
The Certified Lab Technician 8 (CLT8) is a professional certification exam for laboratory technicians who perform routine and moderately complex testing across the clinical laboratory. It suits technicians working in hospital core labs, reference laboratories, physician office labs, and public health settings who want independent verification of their technical knowledge rather than a training certificate. The CLT8 case studies are 5 cases and about 3,964 words.
1The 23-Gauge Butterfly, the Short Citrate Tube, and a Biopsy at 14:00
A 71-year-old woman attends the emergency department with confusion and is booked for a liver biopsy at 14:00. A phlebotomist uses a 23-gauge butterfly in the dorsum of the hand and draws, in this order, a 2.0 mL K2EDTA tube (filled to about 0.7 mL), a 2.7 mL sodium citrate tube for PT/APTT (filled to about 1.3 mL) and a 4 mL lithium heparin tube, the last one transferred from a 5 mL syringe.
921 words, about 5 min2A New Creatinine Reagent Lot, a Five-Day QC Shift, and Eighteen Dialysis Patients
On Monday a 600-bed hospital laboratory loads a new lot of creatinine reagent on its chemistry analyzer. Calibration with the calibrator lot already in use is accepted, with a slope within 5% of the previous calibration.
773 words, about 4 min3A Sodium of 123 mmol/L With a Normal Measured Osmolality
A 68-year-old man has three weeks of fatigue and weight loss, no vomiting or diarrhoea, and is clinically euvolemic with normal blood pressure and no oedema. Blood is drawn into a lithium heparin tube at 08:00 and analysed at 10:00 on a chemistry analyser that uses indirect (diluted) ion-selective electrodes.
765 words, about 4 min4A Cold Van, an MCHC of 45.6 g/dL, and a Request for a "Stat" Haemoglobin
A 58-year-old woman attends the emergency department on a January morning with a temperature outside of −5°C. Blood is drawn at 08:10 into a 4 mL K2EDTA tube, transported in an unheated courier van and received at 10:05; it is analysed at 10:40.
758 words, about 4 min5One Positive Anaerobic Bottle After Knee Arthroplasty
A 64-year-old man is on day 6 after a total knee arthroplasty. He has a temperature of 38.7°C, a knee that is warm but not draining, WBC 13.8 ×10^9/L and CRP 88 mg/L.
747 words, about 4 min