Preclinical
How to Approach USMLE Questions
by Mike
Apr 11, 2026 · 8 min read
Preclinical
by Mike
Apr 11, 2026 · 8 min read
The way you work a USMLE question doesn't change between Step 1, Step 2 CK, Step 3, a shelf, or an NBME form. The content changes. The reading doesn't. If you do it the same way every time, you make fewer careless mistakes and you get more of the questions you aren't sure about.
Almost every question asks one of three things.
The first is diagnosis. What does this patient have? You get a vignette and pick the most likely diagnosis or underlying cause.
The second is management. What do you do next? You're handed a diagnosis, or enough to work one out, and asked for the next step in workup or treatment.
The third is prevention. Which screening test, vaccine, counseling point, or risk factor applies here? These pull from preventive care, epidemiology, and public health.
Figure out which one you're looking at before you read the choices. A diagnosis question wants a differential. A management question wants the algorithm. A prevention question wants the guideline.
The first sentence usually gives you the patient and the chief complaint. The last sentence is the actual question. Read those two before anything else. By then you should know who the patient is, what you're being asked (diagnosis, next step, most likely cause, best initial test), and which of the three kinds of question this is.
Now read the stem start to finish, looking for whatever answers the question you were just asked. Build a differential off the chief complaint and history, then cut it down with the exam, labs, imaging, and pertinent negatives.
Pertinent positives push you toward a diagnosis. Crushing substernal chest pain, diaphoresis, and a rising troponin is an MI. Pertinent negatives take things off the table. Chest pain that isn't pleuritic, isn't reproducible on palpation, and has nothing to do with swallowing makes musculoskeletal, pleuritic, and esophageal causes less likely.
Assume every detail was put there on purpose. A listed medication may be the cause. A line of social history may be the whole answer. A lab value is either abnormal or a pertinent normal.
Decide what you think the answer is first. That keeps a plausible distractor from talking you into it. If your answer is there, you're most of the way done. If it isn't, go back over your reasoning and find the closest fit.
Even when your answer jumps out, read all five. Sometimes there's a better one you didn't think of, or two choices are close and you have to tell them apart. Knock out the obviously wrong ones first. If you're down to two, reread the last sentence and pick the one that answers exactly what it asks.
Context beats buzzwords. Anki and pattern recognition give you a starting differential, but the exam keeps moving toward reading the whole picture. "Tearing" chest pain suggests dissection, and the rest of the stem can still point somewhere else. Use the buzzword to start the differential and the stem to finish it.
Ask what the writer is testing. Each question exists to check one concept. When two choices look close, asking "what do they want me to know here?" often settles it.
ABCs first. In an acute or emergent management question, airway, breathing, and circulation come before almost everything else. Stabilize the unstable patient before you order imaging.
Common things are common. Unless the stem hands you findings that point to something rare, the most common cause of the presentation is usually right. The exam mostly tests whether you recognize common diseases.
Don't talk yourself out of an easy question. If it looks straightforward, it probably is. "It seemed too easy" is not a reason to switch. At the same time, don't be scared of changing answers. Studies of multiple-choice exams keep finding that most changes go from wrong to right. If you reread the stem and find something you missed, change it.
Watch the clock. You get about 90 seconds a question. If one is eating your time, pick your best answer, flag it, and move on. Four or five minutes on one question costs you questions you would have gotten.
Question 1: A 65-year-old woman 1 day s/p open appendectomy complicated by perforation with peritonitis presents with dyspnea and hypoxemia. PMH includes hypothyroidism, SLE, CAD, breast adenocarcinoma s/p resection and radiation 10 years ago. Her hospital stay has been complicated by gram negative sepsis requiring 2 L Lactated Ringers and antibiotics. Her current medications include intravenous piperacillin-tazobactam (Zosyn), vancomycin, home hydroxychloroquine, levothyroxine, subcutaneous enoxaparin. Her dyspnea began 1 hour ago, and you have been paged regarding an oxygen desaturation to 85% 20 minutes ago requiring 2L O2 by NC. Vitals are HR 110 T 100.5 F BP 110/80 RR 24 SpO2 82% on 4L NC. Exam reveals JVP 7 cm without change on inspiration, increased work of breathing, and bilateral lung crackles on auscultation. DP and radial pulses are 2+ bilaterally. Cardiac examination reveals 2/6 systolic ejection murmur over the upper right sternal border without additional heart sounds. ABG reveals PaO2 59 PCO2 51. Other than IV bolus of additional fluids and continued antibiotics, what is the next step in management?
A. Spiral CT Angiography B. Intravenous Hydrocortisone C. Administration of Positive Pressure to the airway D. CT of abdomen with and without contrast E. Intravenous norepinephrine infusion
Question 2: What is the most likely cause of her presentation?
A. Decreased cardiac contractility B. Adrenal failure from prolonged steroid use C. Occlusion of the pulmonary artery D. Cytokine release and inflammation from acute insult E. Acute myocardial ischemia
Answers: 1. C, 2. D
First and last sentences. A 65-year-old woman, post-op, now dyspneic and hypoxemic. The question wants the next step beyond fluids and antibiotics. So this is a management question about acute respiratory distress after surgery.
The directed read. My starting differential for post-op dyspnea and hypoxemia is PE, ARDS, MI, cardiogenic shock, TRALI, and central hypoventilation. Then I go through the stem:
That's ARDS from sepsis.
My answer before the choices. ARDS needs PEEP, either CPAP/BiPAP or mechanical ventilation. It's also an ABC problem. She needs breathing support before anything else.
The choices. C is positive pressure to the airway, which is what I predicted. The rest don't fix the breathing. Spiral CT (A) is for PE. Hydrocortisone (B) is for adrenal insufficiency. A CT of the abdomen (D) does nothing for the respiratory emergency. Norepinephrine (E) is for refractory hypotension, and her pressure is 110/80.
For Question 2, ARDS comes from acute damage at the alveolar-capillary interface after an insult. Vessels get leaky and protein floods the alveoli. That's D, cytokine release and inflammation from an acute insult.
What it's testing is whether you can sort out post-op respiratory distress and put the ABCs first.
Misreading the question. "Most likely diagnosis" and "next best step" have different answers for the same patient.
Answering the question you wanted. If it asks for the next step in management and treatment is indicated, don't pick a diagnostic test. The reverse is also true.
Reaching for the biggest intervention. The answer is usually the simplest direct next step. Don't jump to surgery when medical management comes first, and don't order a CT when a plain film or an exam will do.
Changing answers on a hunch. Change when you find what you missed. Leave it alone when you just feel uneasy.
Not eliminating. Crossing off even one or two choices helps your odds a lot.
Getting stuck. Flag it and come back. The hard question is worth the same as the easy one you haven't reached yet.
You get better at this by doing questions, not by reviewing more content. Every block, do the same five things on purpose:
After a few hundred questions you stop thinking about the steps.
Best of luck!
Mike
Disclaimer: StrudelMed / Strudel Academy LLC is an independent medical education resource. The content above is not medical or clinical advice and is intended for educational purposes and general guidance only.