Step 2 CK covers everything you've seen in third year — internal medicine, surgery, OB/GYN, pediatrics, psychiatry, and more — across 280 questions testing your ability to manage real patients in real clinical situations.
The scope is enormous. But like Step 1, Step 2 CK is heavily concentrated around specific presentations, decision points, and management algorithms that appear again and again. Students who know these cold — who can immediately recognize a presentation and know the next best step without hesitating — consistently outperform students who know more content but can't apply it under pressure.
Here's what to prioritize, organized by system.
How Step 2 CK Tests Clinical Knowledge
Step 2 CK is almost entirely "next best step" questions. You'll rarely see "what is the definition of X." You'll constantly see "a 54-year-old man presents with crushing chest pain — what do you do next?"
This means knowing management algorithms cold is more important than memorizing pathophysiology. You need to know the sequence: when do you order imaging? When do you treat empirically? When do you refer? When is this a surgical emergency? When do you reassure and follow up?
The other key pattern: Step 2 CK loves testing what you do when the textbook answer isn't an option. The distractors are clinically plausible. Every answer choice sounds reasonable. What separates the right answer is usually a detail buried in the vignette — a vital sign, a timing clue, a contraindication — that changes the management.
Read every vignette twice before committing to an answer.
Internal Medicine
Internal medicine is the largest content area on Step 2 CK. Expect it to make up a substantial portion of your exam.
Cardiology
- ACS: Know the STEMI vs. NSTEMI distinction cold. STEMI → emergent PCI (or tPA if PCI unavailable within 120 min). NSTEMI → risk stratify, anticoagulate, stress test or cath depending on risk. Dual antiplatelet + anticoagulation.
- Heart failure: HFrEF management — ACE inhibitor (or ARB/ARNI), beta blocker, aldosterone antagonist, SGLT-2 inhibitor. Know the signs of decompensation and when to diurese vs. when the patient is in cardiogenic shock.
- Atrial fibrillation: Rate vs. rhythm control decision. CHA₂DS₂-VASc score for anticoagulation. Know when to cardiovert and the risk of thromboembolism with cardioversion without adequate anticoagulation.
- Hypertensive emergencies: BP > 180/120 with end-organ damage → IV labetalol or nitroprusside. Hypertensive urgency (no end-organ damage) → oral agents, lower BP over 24–48 hours.
- Valvular disease: Aortic stenosis (exertional syncope, angina, dyspnea — systolic murmur), mitral regurgitation (holosystolic murmur at apex), aortic regurgitation (wide pulse pressure, diastolic murmur). Know when surgical intervention is indicated.
Pulmonology
- Pneumonia: CAP outpatient → azithromycin or doxycycline (respiratory fluoroquinolone if comorbidities). CAP inpatient → beta-lactam + macrolide. Know the distinction between CAP, HAP, aspiration, and atypical pneumonia.
- COPD and asthma exacerbations: COPD → bronchodilators + systemic steroids + antibiotics if purulent sputum. Asthma → SABA + systemic steroids. Know when to intubate: rising CO₂, altered mental status, exhaustion.
- PE: Wells criteria → low probability → D-dimer. High probability → CT-PA. Massive PE (hemodynamically unstable) → thrombolytics. Anticoagulate with heparin, then transition to DOAC or warfarin.
- Pleural effusion: Transudative (CHF, cirrhosis, nephrotic syndrome) vs. exudative (Light's criteria — infection, malignancy, PE). Know the workup and indications to tap.
- Interstitial lung disease: IPF vs. sarcoidosis vs. hypersensitivity pneumonitis — know the distinguishing features and imaging findings.
Gastroenterology
- GI bleeding: Upper GI (hematemesis, melena) → NPO + IV PPI + endoscopy. Lower GI (hematochezia) → colonoscopy. Acute variceal bleed → octreotide + IV PPI + endoscopy + prophylactic antibiotics.
- Acute abdomen: Appendicitis (RLQ pain, rebound, fever → CT → surgery), cholecystitis (RUQ pain post-fatty meal, Murphy's sign → ultrasound → cholecystectomy), pancreatitis (epigastric pain radiating to back, elevated lipase → IVF + bowel rest).
- IBD: Crohn's (skip lesions, transmural, fistulas) vs. UC (continuous, mucosal, starts at rectum). Complications: toxic megacolon (UC), fistulas (Crohn's), colorectal cancer risk in both.
- Liver disease: Ascites → diurese; SBP (fever + ascites → tap → PMN > 250 → cefotaxime). Hepatic encephalopathy → lactulose + rifaximin. Hepatorenal syndrome → vasoconstrictors + albumin.
- Colorectal cancer screening: Average risk → colonoscopy at 45–50. High risk (family history, IBD) → earlier and more frequent.
Nephrology
- AKI: Prerenal (BUN:Cr > 20, FENa < 1%, responds to fluids) vs. intrinsic (ATN — muddy brown casts, FENa > 2%) vs. postrenal (obstruction → bladder scan → relieve obstruction).
- CKD complications: Anemia (EPO deficiency → EPO + iron), secondary hyperparathyroidism, metabolic acidosis, hyperkalemia. Know when to refer for dialysis.
- Electrolytes: Hyponatremia — volume status determines management (SIADH → fluid restrict; hypovolemic → NS). Hyperkalemia — peaked T waves → calcium gluconate → insulin + dextrose → kayexalate/patiromer → dialysis. Hypercalcemia — malignancy vs. hyperparathyroidism (bones, stones, groans, moans).
Endocrinology
- DKA vs. HHS: DKA (type 1, anion gap acidosis, ketones → insulin drip + aggressive IVF + K replacement). HHS (type 2, extreme hyperglycemia without ketoacidosis → aggressive IVF + insulin, slower correction).
- Thyroid storm: PTU first (blocks synthesis + peripheral conversion) → then iodine → beta blocker + steroids.
- Adrenal crisis: Hypotension + hyponatremia + hyperkalemia + hyperpigmentation (primary) → immediate IV hydrocortisone. Do not wait for workup.
Hematology and Oncology
- Anemia workup: Iron deficiency (low MCV, low ferritin, high TIBC) vs. B12/folate deficiency (high MCV, hypersegmented neutrophils) vs. anemia of chronic disease (normal/low MCV, low TIBC, low-normal ferritin).
- Bleeding disorders: Platelet disorders (prolonged bleeding time, normal PT/PTT) vs. coagulation factor disorders (prolonged PT and/or PTT).
- Oncologic emergencies: SVC syndrome, spinal cord compression (MRI + dexamethasone + radiation/surgery — don't delay steroids), tumor lysis syndrome (allopurinol + hydration), neutropenic fever (broad-spectrum antibiotics immediately — don't wait for cultures).
Surgery
Acute Abdomen and Surgical Emergencies
- Appendicitis: CT abdomen/pelvis in adults. Perforated → IV antibiotics + emergent surgery.
- Small bowel obstruction: Dilated loops + air-fluid levels on X-ray. Adhesions are the #1 cause in adults. NGT decompression → if no improvement in 48h or signs of strangulation → surgery.
- Mesenteric ischemia: Sudden severe abdominal pain out of proportion to exam. CT angiography. Surgical emergency — high mortality.
- AAA: > 5.5 cm or rapidly expanding → elective repair. Ruptured AAA (hypotension + back/abdominal pain + pulsatile mass) → emergent OR — don't stop for imaging if unstable.
Trauma
- Primary survey: Airway → Breathing → Circulation → Disability → Exposure. Secure the airway first.
- Tension pneumothorax: Tracheal deviation, absent breath sounds, hypotension → immediate needle decompression (2nd ICS, midclavicular line). Do not wait for chest X-ray.
- Hemorrhagic shock: Massive transfusion protocol — 1:1:1 ratio (pRBC:FFP:platelets). Permissive hypotension until surgical hemorrhage control.
Post-Operative Management
- Post-op fever mnemonic — the 5 W's: Wind (atelectasis, days 1–2), Water (UTI, days 3–5), Wound (surgical site infection, days 5–7), Walking (DVT/PE, day 5+), Wonder drugs (drug fever, any time).
- Anastomotic leak: Fever + tachycardia + abdominal pain after bowel surgery → CT → return to OR.
OB/GYN
Obstetric Emergencies — Know These Cold
- Placenta previa: Painless vaginal bleeding → ultrasound, NO digital exam, C-section
- Placental abruption: Painful vaginal bleeding, rigid uterus, fetal distress → emergent delivery
- Preeclampsia: HTN + proteinuria after 20 weeks → MgSO₄ for seizure prophylaxis, antihypertensives if BP > 160/110, delivery is definitive
- Eclampsia: Seizures + preeclampsia → MgSO₄ + emergent delivery
- Umbilical cord prolapse: Knee-chest position + emergent C-section
- Postpartum hemorrhage: #1 cause is uterine atony → uterine massage + oxytocin
Other High-Yield OB/GYN
- Ectopic pregnancy: Amenorrhea + unilateral pelvic pain + vaginal bleeding → β-hCG + transvaginal ultrasound. Unstable → emergent surgery. Stable + small → methotrexate.
- Gestational diabetes: Screen at 24–28 weeks. Dietary control first, insulin if needed. Complications: macrosomia, shoulder dystocia, neonatal hypoglycemia.
- Ovarian torsion: Sudden unilateral pelvic pain + nausea → Doppler ultrasound → surgical emergency.
- PID: Cervical motion tenderness + adnexal tenderness → treat empirically with ceftriaxone + doxycycline ± metronidazole.
- Post-menopausal bleeding: Endometrial biopsy to rule out cancer — always.
Pediatrics
Developmental Milestones
Know key ages: social smile (6 weeks), stranger anxiety (6–9 months), mama/dada (10 months), 1–2 words (12 months), 2-word phrases (24 months), sentences (36 months). Motor: sitting unsupported (6 months), walking (12 months), running (18 months).
Pediatric Emergencies
- Epiglottitis: High fever, drooling, tripod position, muffled voice → lateral neck X-ray (thumb sign) → secure airway first, no throat exam until intubated
- Croup: Barking cough, stridor, worse at night → racemic epinephrine (moderate/severe) + dexamethasone; "steeple sign" on X-ray
- Bronchiolitis: RSV, < 2 years, wheezing + fever → supportive care only (suction + oxygen). No bronchodilators or steroids.
- Febrile seizure: < 15 minutes, simple → reassure parents, no imaging or LP needed if typical presentation
Psychiatry
- Suicidal ideation with plan + intent → inpatient hospitalization. Know the duty to warn (Tarasoff) — specific threat to identifiable person → must warn.
- First-episode psychosis: Rule out medical causes first (TSH, metabolic panel, urine tox, CT/MRI) before assuming primary psychiatric illness.
- Mood disorders: Starting an antidepressant in undiagnosed bipolar can precipitate mania — always screen for prior manic episodes.
- Anxiety disorders: SSRIs are first-line pharmacotherapy for GAD, panic disorder, PTSD, OCD. Benzodiazepines are second-line, not first-line.
- Alcohol withdrawal timeline: Tremors (6–12h) → seizures (12–24h) → delirium tremens (24–72h). Treat with benzodiazepines. Note: alcohol and benzo withdrawal can be fatal; opioid withdrawal is uncomfortable but not life-threatening.
- Borderline personality disorder: DBT (dialectical behavior therapy) is the first-line treatment.
Ethics and Patient Communication
- Informed consent: Competent adult patients have the right to refuse any treatment — including life-sustaining treatment — even if the decision seems irrational to others.
- Capacity: Decision-specific and can fluctuate. A patient can lack capacity for one decision and retain it for another.
- Confidentiality exceptions: Imminent danger to self or others, child/elder abuse, certain reportable diseases, court orders.
- Advance directives: Living will (specific instructions) vs. durable power of attorney for healthcare (designates a surrogate). If no directive, next-of-kin hierarchy determines the surrogate.
- Breaking bad news — SPIKES: Sit down, establish what the patient knows, deliver information in chunks, respond to emotion before continuing. Don't lead with statistics.
How to Study Step 2 CK High-Yield Topics
Do questions by system early, then switch to mixed blocks. System-specific questions help you correlate content with what actually appears. Mixed blocks in the final two weeks simulate the real exam. Build management algorithms, not fact lists — for every major presentation, know the first test, the first treatment, when it becomes an emergency, and what contraindications change the standard approach. Know when to act before asking more questions. Tension pneumothorax, cord prolapse, eclampsia, anaphylaxis — these test whether you'll treat before you think.
A Resource That Covers What Actually Shows Up
The MedSchoolBro Step 2 Bundle is organized around the presentations and management algorithms that Step 2 CK actually tests — system by system, prioritized for what shows up on exam day. It gives you the clinical framework to work through vignettes efficiently, not just a list of facts to memorize.
Final Thoughts
Step 2 CK is a clinical reasoning exam — and clinical reasoning is built through recognizing patterns and knowing what comes next. Focus your prep on the highest-yield systems, know the management algorithms cold, and practice with questions that force you to make decisions under realistic conditions.
Know what to do next. That's the exam.
Frequently Asked Questions
What is the most heavily tested subject on Step 2 CK?
Internal medicine is the largest content category, covering cardiology, pulmonology, GI, nephrology, endocrinology, hematology, and more. After internal medicine, OB/GYN, surgery, and psychiatry are consistently high-yield. Pediatrics is tested but typically represents a smaller proportion of questions.
How is Step 2 CK different from shelf exams?
Shelf exams are discipline-specific. Step 2 CK integrates all disciplines in a single exam — questions may require you to distinguish a surgical emergency from a medical condition, or apply psychiatric principles to a patient on a medical ward. The integration is what makes it challenging, not the content of any single discipline in isolation.
Should I do all of UWorld for Step 2 CK?
Yes — completing at least one full pass is one of the strongest predictors of exam performance. If time permits, do a second pass on incorrectly answered and flagged questions. Read every explanation, including for questions you answered correctly — the reasoning in UWorld explanations is often more valuable than the question itself.