AOBOG OB-GYN common mistakes
AOBOG OB-GYN · Understand the traps and how to avoid them.
Committing to a single diagnosis for a hypertensive pregnant patient and stopping the workup once preeclampsia is named, without actively excluding HELLP, acute fatty liver, TTP, or lupus flare.
Preeclampsia is so heavily emphasized in training that it becomes the default answer, and candidates anchor on the first plausible label rather than running a differential for thrombocytopenia plus transaminitis.
What to do instead
For every hypertensive patient with lab abnormalities, write the four-item differential explicitly and state one discriminating test or finding for each before selecting the answer.
Choosing a management step that treats the fetus or the mother in isolation when the question hinges on simultaneous maternal stabilization and fetal assessment.
Questions are often read as 'what is the next best step for the baby' when the stem describes a hemodynamically unstable mother, and candidates default to fetal monitoring or delivery timing.
What to do instead
Before answering any obstetric emergency item, ask 'is the mother stable?' If not, the correct answer is almost always maternal resuscitation first; select the option that addresses maternal physiology.
Misclassifying the type and timing of a hypertensive disorder by ignoring the gestational age at onset and the presence or absence of proteinuria or end-organ features.
Candidates memorize labels but do not systematically extract the two or three defining variables from the stem, so chronic hypertension with superimposed preeclampsia gets labeled as gestational hypertension.
What to do instead
Build a habit of writing onset gestational age, blood pressure threshold, proteinuria status, and end-organ involvement on scratch paper before evaluating answer choices.
Failing to recognize when expectant management is contraindicated in preterm premature rupture of membranes and instead selecting prolonged observation.
The appeal of gaining fetal maturity biases answers toward waiting, and candidates underweight signs of chorioamnionitis, abruption, or nonreassuring fetal status that mandate delivery.
What to do instead
For each PPROM item, list absolute delivery indications first (infection, abruption, nonreassuring status, advanced labor) and only consider expectant management if none are present.
Selecting an antibiotic or tocolytic regimen based on familiarity rather than on the specific clinical scenario, such as using a beta-agonist when maternal cardiac disease is described.
Candidates recall a favored drug from a prior rotation and do not screen the stem for contraindications like tachycardia, diabetes, or cardiac disease.
What to do instead
For every pharmacologic answer, scan the stem for absolute contraindications and eliminate any drug that conflicts with a stated comorbidity before choosing.
Misinterpreting fetal heart rate tracings by labeling a deceleration pattern without linking it to contraction timing and baseline variability.
Candidates focus on the deceleration shape alone and neglect the two other elements (baseline rate and variability) that determine whether the pattern is reassuring or Category III.
What to do instead
Describe every tracing in three components (baseline, variability, decelerations with timing) before classifying it, and only then choose management.
Applying a single abnormal cervical cancer screening result to a management algorithm without first confirming the patient's age, prior screening history, and pregnancy status.
Candidates recall a general algorithm for abnormal cytology but skip the modifiers that change the pathway, such as age under 25, prior hysterectomy, or current pregnancy.
What to do instead
Before answering any screening-abnormality item, extract age, prior results, immune status, and pregnancy status from the stem and verify the chosen pathway matches all of them.
Choosing a surgical approach for abnormal uterine bleeding or adnexal mass without first establishing the patient's desire for future fertility and menopausal status.
Candidates jump to the definitive procedure (hysterectomy, oophorectomy) because it is familiar, without checking the reproductive goals and hormonal status stated in the stem.
What to do instead
For every gynecologic surgical item, state the patient's fertility desire and menopausal status on scratch paper and eliminate any option that conflicts with either.
Confusing the diagnostic criteria and first-line management of the common causes of abnormal uterine bleeding and selecting a treatment that does not match the underlying category.
Candidates memorize a list of causes but do not map the stem's specific findings (ovulatory vs anovulatory, structural vs nonstructural) to the corresponding first-line therapy.
What to do instead
Classify the bleeding as structural or nonstructural and ovulatory or anovulatory first, then select the therapy indicated for that category rather than the most familiar drug.
Overlooking the possibility of an ectopic pregnancy or a non-gynecologic cause when a reproductive-age patient presents with abdominal pain or a positive pregnancy test.
Candidates anchor on the most likely gynecologic diagnosis and do not systematically exclude life-threatening alternatives such as ectopic pregnancy, appendicitis, or ovarian torsion.
What to do instead
For any reproductive-age patient with pain or a positive pregnancy test, write a mandatory exclusion list (ectopic, torsion, appendicitis) and verify the chosen answer addresses the most dangerous possibility first.