Study guide
This chapter combines two mid-weighted disciplines from the official outline: surgery (roughly 5-15% of items) and obstetrics/gynecology (roughly 10-20% of items), figures that the testing organization can adjust over time. Surgical vignettes on Step 2 CK are rarely about performing an operation; they test whether you can recognize when imaging, observation, or the operating room is the right next step. Ob/Gyn vignettes lean on ACOG-aligned, guideline-level standards for pregnancy, labor, contraception, and gynecologic screening.
The Acute Abdomen: Sorting Surgical from Medical
Acute abdomen vignettes test a layered decision process: is this patient stable, what does the pattern of pain and exam findings suggest, and does the picture demand imaging, observation, or immediate surgery. Peritoneal signs (rebound tenderness, guarding, rigidity) in an unstable patient point toward emergent surgical exploration without waiting for extensive imaging. A stable patient with a classic pattern, such as periumbilical pain migrating to the right lower quadrant with anorexia, fever, and localized tenderness, suggests appendicitis; the next step is typically confirmatory imaging (ultrasound in children and pregnant patients, CT in most adults) followed by surgical consultation. Right upper quadrant pain after fatty food, with a positive Murphy sign, suggests cholecystitis, generally confirmed with ultrasound and managed with cholecystectomy, with timing depending on the patient's stability and clinical course. Colicky flank pain radiating to the groin with hematuria points toward nephrolithiasis, a largely medical rather than surgical problem unless there is obstruction with infection, which becomes a urologic emergency. A distended, tympanic abdomen with high-pitched bowel sounds and a history of prior abdominal surgery suggests small bowel obstruction from adhesions, where initial management is typically nasogastric decompression and fluid resuscitation, reserving surgery for signs of strangulation or failure to improve. Free air on imaging, indicating a perforated viscus, is a surgical emergency regardless of how well the patient looks at the moment.
Trauma and Perioperative Management
Trauma vignettes typically follow the primary survey sequence: airway, breathing, circulation, disability, exposure. A trauma patient with a compromised airway or inadequate ventilation is addressed before any other injury is fully evaluated, even a dramatic-looking limb fracture. Hypotension after trauma is assumed to be hemorrhagic until proven otherwise, and the next step is fluid or blood product resuscitation while searching for the bleeding source, often with a rapid bedside ultrasound (FAST exam) to check for free intra-abdominal or pericardial fluid. A tension pneumothorax, presenting with hypotension, absent breath sounds on one side, and tracheal deviation, requires immediate needle or finger decompression before imaging confirms it, because waiting for a chest X-ray in an unstable patient costs time the patient does not have. Perioperative vignettes test preoperative risk assessment (cardiac and pulmonary clearance based on functional status and planned procedure) and postoperative complication timing, which follows a predictable pattern: fever in the first 24 to 48 hours after surgery is often attributed to atelectasis, fever around day 3 to 5 raises concern for urinary tract infection or pneumonia, and fever after day 5 raises concern for surgical site infection or a deep abscess, sometimes remembered with the mnemonic wind, water, wound, walking (deep vein thrombosis), and wonder drugs. Postoperative hypotension with tachycardia should prompt evaluation for bleeding first, and a falling hematocrit with abdominal distension after a recent operation suggests intra-abdominal hemorrhage requiring prompt reassessment.
Prenatal Care and Labor Complications
Prenatal vignettes test recognition of routine screening timing and complications that change the management plan. Early prenatal visits establish dating, screen for anemia, blood type and antibody status, and infectious diseases, and offer aneuploidy screening options. Gestational diabetes is typically screened for with a glucose challenge test in the late second to early third trimester (around 24 to 28 weeks) window used by most guideline-based protocols, and a patient with an elevated result moves to a confirmatory longer glucose tolerance test. Preeclampsia vignettes test the ability to recognize new hypertension after 20 weeks gestation with proteinuria or other severe features (such as visual disturbance, right upper quadrant pain, or thrombocytopenia); the definitive treatment is delivery, timed according to gestational age and severity, with magnesium sulfate used for seizure prophylaxis in severe disease. A pregnant patient with painless third-trimester vaginal bleeding raises concern for placenta previa, where digital cervical exam is avoided until previa is excluded by ultrasound, whereas painful bleeding with a rigid, tender uterus suggests placental abruption. During labor, an abnormal fetal heart tracing with recurrent late decelerations suggests uteroplacental insufficiency, prompting maternal repositioning, oxygen, and fluids first, with expedited delivery if the pattern does not improve. A prolapsed umbilical cord, identified by a palpable pulsating structure on vaginal exam with fetal bradycardia, is an obstetric emergency requiring immediate steps to relieve cord compression and prompt cesarean delivery.
Contraception and Menstrual Disorders
Contraception vignettes test matching a method to a patient's medical history and preferences, particularly recognizing contraindications. Combined estrogen-progestin methods are generally avoided in patients with a history of venous thromboembolism, certain migraines with aura, or significant cardiovascular risk factors, in which case a progestin-only method or a non-hormonal option (such as the copper intrauterine device) is preferred. Long-acting reversible contraceptives (intrauterine devices and subdermal implants) are highlighted on the exam as highly effective, reversible, and appropriate for most patients including adolescents and those who have not yet had children, reflecting current guideline-level thinking that prior restrictions on IUD use in nulliparous patients are not well supported. Emergency contraception options depend on timing since intercourse and patient weight, with the copper IUD noted as the most effective option when timing allows. Menstrual disorder vignettes often test distinguishing abnormal uterine bleeding causes by age: adolescents most often have anovulatory cycles related to an immature hypothalamic-pituitary-ovarian axis, reproductive-age patients raise consideration of structural causes such as fibroids or polyps alongside pregnancy (which must always be excluded first), and postmenopausal bleeding is considered endometrial cancer until proven otherwise, prompting endometrial sampling. Polycystic ovary syndrome vignettes combine irregular cycles, clinical or laboratory evidence of excess androgen, and sometimes imaging findings, with management directed at the patient's goals, whether that is cycle regulation, fertility, or metabolic risk reduction.
Gynecologic Malignancy Screening
Screening vignettes test whether you know which test applies to which cancer and which patient population, using ACOG-aligned, guideline-level frameworks (exact starting ages and intervals are periodically revised, so treat specific numbers as representative rather than fixed). Cervical cancer screening generally begins in the mid-twenties and continues with either primary high-risk HPV testing or combined cytology and HPV co-testing at multi-year intervals through the mid-sixties, with screening able to stop after that if prior results have been consistently reassuring. An abnormal Pap or HPV result does not automatically mean cancer; the next step is typically colposcopy with directed biopsy to characterize the abnormality before deciding on treatment. There is no standard population-wide screening test for ovarian cancer, which is why the exam frequently tests recognition of vague symptoms (bloating, early satiety, pelvic pressure) in a patient who ultimately needs pelvic imaging and, if a mass is found, further workup rather than reassurance. Endometrial cancer has no routine screening test either; instead, any postmenopausal bleeding is the trigger for evaluation, usually with endometrial biopsy or sometimes transvaginal ultrasound to assess endometrial thickness first. Breast cancer screening with mammography, while sometimes tested in gynecologic contexts, follows separate guideline-level age and interval recommendations that a Step 2 CK vignette will typically specify in the stem's own screening history rather than requiring you to memorize every organization's exact numbers.
Key terms
- FAST exam
- — Focused Assessment with Sonography for Trauma; a rapid bedside ultrasound checking for free fluid in the abdomen or around the heart.
- Tension pneumothorax
- — A collapsed lung with air trapped under pressure, causing hypotension and tracheal deviation, requiring immediate decompression.
- Small bowel obstruction
- — Blockage of the small intestine, often from adhesions, presenting with distension, vomiting, and high-pitched bowel sounds.
- Preeclampsia
- — New hypertension after 20 weeks of pregnancy with proteinuria or other severe features, definitively treated by delivery.
- Placenta previa
- — A placenta covering or near the cervical os, causing painless third-trimester bleeding; digital exam is avoided until it is excluded by ultrasound.
- Placental abruption
- — Premature separation of the placenta from the uterine wall, causing painful bleeding with a firm, tender uterus.
- Late decelerations
- — A fetal heart rate pattern suggesting uteroplacental insufficiency, initially managed with repositioning, oxygen, and fluids.
- Long-acting reversible contraception (LARC)
- — Highly effective, reversible contraceptive methods (IUDs and subdermal implants) appropriate for most patients, including adolescents.
- Postmenopausal bleeding
- — Vaginal bleeding after menopause, considered endometrial cancer until proven otherwise and evaluated with endometrial sampling.
- Colposcopy
- — Magnified examination of the cervix with directed biopsy, performed after an abnormal cervical cancer screening result.
- Polycystic ovary syndrome (PCOS)
- — A condition of irregular ovulation and excess androgen effect, diagnosed using a combination of clinical and laboratory criteria.
Exam tips
- In any acute abdomen stem, decide stability first; an unstable patient with peritoneal signs goes to surgery, not to a lengthy imaging workup.
- Memorize the rough postoperative fever timeline (atelectasis early, infection mid-course, wound or clot later) as a fast way to prioritize the differential.
- For third-trimester bleeding, painless suggests previa (avoid digital exam until ultrasound), while painful with a rigid uterus suggests abruption.
- Always exclude pregnancy first in a reproductive-age patient with abnormal bleeding before moving to structural or hormonal explanations.
- Postmenopausal bleeding is endometrial cancer until proven otherwise; do not let a benign-sounding stem talk you out of ordering endometrial sampling.