ABPS Obstetrics & Gynecology common mistakes
ABPS Obstetrics & Gynecology · Understand the traps and how to avoid them.
Choosing the 'most thorough' workup or the most aggressive intervention when the question stem asks for the next best step in an otherwise stable patient (e.g., ordering a full thrombophilia panel for a first-trimester loss, or jumping to laparotomy for a hemodynamically stable adnexal mass).
Candidates equate comprehensiveness with correctness and fear missing a diagnosis, so they select the option that 'rules out everything' rather than the one that matches the acuity and likelihood in the vignette.
What to do instead
Before answering, classify the patient as stable vs unstable and low vs high pretest probability. The correct next step is almost always the least invasive test or intervention that changes management for that acuity level; reserve exhaustive panels and surgery for red-flag findings.
Misassigning gestational age when dating is discordant - accepting a last menstrual period over an early ultrasound, or treating a late first-trimester ultrasound as definitive when an earlier one exists.
Candidates default to the LMP because it appears first in the stem, forgetting that ultrasound dating supersedes LMP when the discrepancy exceeds accepted thresholds, and that the earliest scan is the most accurate.
What to do instead
Memorize the reassignment thresholds (e.g., ~7 days in the first trimester, ~10–14 days in the second) and always anchor dating to the earliest available ultrasound; state the rule explicitly when reasoning through the item.
Managing abnormal uterine bleeding by symptom alone without stratifying by age and risk factors for endometrial hyperplasia or cancer before choosing treatment.
Candidates reflexively pick hormonal therapy or reassurance and skip the endometrial sampling step, especially in younger patients, because they anchor on 'benign' etiologies.
What to do instead
Build a fixed checklist for abnormal uterine bleeding: pregnancy test, then age/risk-based endometrial sampling (e.g., any postmenopausal bleeding, and premenopausal patients with risk factors such as obesity, chronic anovulation, or unopposed estrogen), then treat.
Under-staging or over-staging in the mind: picking a treatment plan (e.g., radical hysterectomy, fertility-sparing surgery, or adjuvant therapy) before establishing stage and histologic risk features.
Candidates jump from diagnosis to treatment and conflate clinical and surgical staging, or forget that nodal assessment and depth of invasion drive management.
What to do instead
For every oncology item, first write the stage and the key prognostic features (histology, grade, depth of invasion, nodal status, LVSI), then match treatment to that stage; verify whether the question is asking for staging or management.
Treating anovulatory infertility with ovulation induction alone while ignoring tubal patency, semen analysis, and uterine evaluation, or moving to advanced technology before confirming the diagnosis.
Candidates anchor on the most visible problem (anovulation) and skip the complete infertility workup, or they over-rely on clomiphene without considering alternatives for specific diagnoses such as PCOS with insulin resistance or hypogonadotropic hypogonadism.
What to do instead
Always complete the standard infertility evaluation (semen analysis, ovulation assessment, tubal patency, uterine cavity) before selecting therapy, and match the induction agent to the underlying diagnosis and patient profile.
Recommending surgery as first-line for pelvic organ prolapse or stress urinary incontinence without first offering and documenting conservative measures (pelvic floor muscle training, pessary, behavioral/weight interventions) in an appropriate candidate.
Candidates equate definitive correction with best care and forget that guidelines favor stepwise conservative management, and that patient goals and childbearing plans modify the choice.
What to do instead
For prolapse and incontinence items, state the conservative options first, identify the patient factors that justify moving to surgery (failed conservative therapy, patient preference, advanced prolapse), and match the procedure to the compartment and to continence status.
Ignoring perioperative risk modification and prophylaxis: proceeding to elective surgery without addressing anemia, glycemic control, or VTE risk, and omitting indicated antibiotic or thromboprophylaxis decisions.
Candidates focus on the operative steps and forget the perioperative medicine that surrounds them, and they underweight procedure-specific VTE risk.
What to do instead
Before any surgical item, run a fixed perioperative checklist: indication, optimization (anemia, glucose, smoking), antibiotic prophylaxis, VTE risk stratification and prophylaxis, and postoperative disposition.
Failing to apply age- and risk-based cancer screening and immunization intervals correctly - e.g., misapplying cervical cancer screening intervals after abnormal results, or recommending screening outside the indicated age range.
Candidates memorize isolated numbers without the decision tree that determines the next interval, and they conflate average-risk with high-risk screening.
What to do instead
Learn screening as algorithms, not isolated facts: for cervical screening, trace the prior result to the correct follow-up test and interval; for breast and colorectal screening, anchor to age and risk category. Rehearse the branch points explicitly.
Resolving ethical dilemmas by deferring entirely to family preference or by choosing the legally safest option rather than the ethically correct one - e.g., honoring a family's request to withhold information from a competent patient.
Candidates confuse beneficence and family-centered care with surrogate decision-making authority, and they fear conflict with relatives.
What to do instead
Apply a fixed hierarchy: assess decision-making capacity first; a capacitated patient's autonomy governs; surrogates act only for patients lacking capacity and must follow substituted judgment or best interests. Name the principle you are applying in your rationale.
Managing obstetric emergencies (postpartum hemorrhage, shoulder dystocia, eclampsia, non-reassuring fetal status) by selecting a single intervention instead of the correct sequenced bundle and escalation pathway.
Candidates treat emergency items as single-best-answer knowledge questions and pick the 'most definitive' step, missing that these are protocol-driven sequences with defined next steps when the first fails.
What to do instead
Memorize the major emergency bundles as ordered algorithms (e.g., hemorrhage: uterotonics, massage, exam for retained tissue/laceration, tranexamic acid, balloon, escalation; shoulder dystocia: the maneuver sequence). When answering, identify the current step in the sequence and the trigger for escalation.