What is the relationship between USMLE Step 1, Step 2 CK, and NBME Shelf Exams?

NBME Subject Examinations (shelf exams) assess rotation-specific clinical competency at the conclusion of third- and fourth-year clerkships. Their vignette structure, distractor format, and blueprint dimensions directly prepare students for USMLE Step 2 CK (scored on a 3-digit numeric scale). USMLE Step 1 assesses foundational biomedical mechanisms on a Pass/Fail scale, while Step 2 CK evaluates clinical diagnosis, pharmacotherapy, and health systems science.

What are the blueprint weights and specifications for USMLE Step 1 and Step 2 CK?

USMLE Step 1 consists of 7 blocks (up to 280 questions) heavily weighting pathology (45%–52%), physiology (25%–35%), and pharmacology (15%–22%) across organ systems. USMLE Step 2 CK consists of 8 blocks (up to 318 questions) prioritizing patient care diagnosis (40%–45%), pharmacotherapy and management (20%–25%), and health maintenance/prevention (15%–20%).

What are NBME Subject Examinations (Shelf Exams)?

Official NBME Subject Examinations, commonly known as shelf exams, are standardized assessments administered by medical schools at the conclusion of clinical clerkships and sub-internships to evaluate student diagnostic acumen and clinical competency against national benchmarks.

What clinical specialties have official NBME shelf exam content outlines?

NBME administers clinical science subject exams for Ambulatory Care, Clinical Neurology, Family Medicine Modular, Medicine (Internal Medicine), Obstetrics & Gynecology, Pediatrics, Psychiatry, Surgery, Emergency Medicine, Advanced Internal Medicine, and Comprehensive Clinical Science (CCSE).

What criteria and dimensions does NBME use to construct shelf exams?

Every NBME shelf examination is constructed across four core blueprint dimensions: (1) System Blueprints (organ systems), (2) Physician Competencies and Tasks (Diagnosis, Pharmacotherapy, Health Maintenance, Disease Mechanisms), (3) Sites of Care (Ambulatory, Inpatient, Emergency), and (4) Patient Age Distributions (Pediatric, Adult, Geriatric).

Official USMLE & NBME Clinical Science Blueprints & Criteria

USMLE Step & NBME Shelf Exam Topics, Criteria & Blueprints

Official NBME Subject Examinations (commonly known as “shelf exams”) and USMLE Step Examinations (Step 1 and Step 2 CK) are standardized medical board assessments administered across medical school and clinical training. NBME and the USMLE composite committee publish official examination criteria—comprising discipline and organ system blueprints, physician competencies and tasks, sites of care, and patient age distributions—as dedicated content outlines for each milestone.

USMLE Board StepsStep 1 & 2 CK

Core Clerkships8 Specialties

Full Blueprint220+ Metrics

Criteria Standard100% Extracted

Showing 14 of 14 board & shelf examinations

USMLE National BoardFoundational Science Applied to Clinical Medicine

USMLE Step 1 Examination

Overview USMLE Outline

Comprehensive assessment of foundational biomedical science principles and mechanisms underlying health, disease, and modes of therapy, emphasizing organ-system pathophysiology and integrative scientific reasoning.

Testing Format: 7 blocks • Up to 280 questions (60 min/block • Pass/Fail Standard)

Sites of Care: Foundational Science Applied to Clinical Medicine

Patient Demographics: Full Lifespan (Infant, Pediatric, Adult, Geriatric)

Complete Official Blueprint Specifications26 Metrics

Table 1: Organ System Content Weightings

Reproductive & Endocrine Systems12%–16%

Respiratory & Renal/Urinary Systems11%–15%

Behavioral Health & Nervous Systems/Special Senses10%–14%

Blood & Lymphoreticular/Immune Systems9%–13%

Musculoskeletal, Skin & Subcutaneous Tissue8%–12%

Multisystem Processes & Disorders8%–12%

Cardiovascular System7%–11%

Gastrointestinal System6%–10%

Social Sciences (Communication, Interpersonal, Ethics)6%–9%

Biostatistics & Epidemiology / Population Health4%–6%

Human Development1%–3%

Core Clinical Tasks & Competencies

Applying basic science principles to etiologies, cellular mechanisms & therapeutics
Interpreting laboratory panels, histological micrographs & gross pathological specimens
Distinguishing physiological compensatory responses from primary underlying pathology
Integrating pharmacodynamics, pharmacokinetics, and autonomic drug interactions

Practice Step 1 Vignettes

Overview Official Criteria

USMLE National BoardAmbulatory (50%–55%)

USMLE Step 2 Clinical Knowledge (Step 2 CK)

Overview USMLE Outline

Assessment of clinical science knowledge, diagnostic acumen, and supervised patient management essential for clinical practice, with heavy emphasis on health promotion, disease prevention, and acute/chronic clinical interventions.

Testing Format: 8 blocks • Up to 318 questions (60 min/block • Scored 3-digit scale)

Sites of Care: Ambulatory (50%–55%), Inpatient (35%–40%), Emergency Department (10%–15%)

Patient Demographics: Pediatric (17%–27%), Adult (55%–65%), Geriatric (15%–20%)

Complete Official Blueprint Specifications28 Metrics

System-Based Content Specifications

Renal & Urinary System & Reproductive Systems7%–13%

Cardiovascular System6%–12%

Musculoskeletal System / Skin & Subcutaneous Tissue6%–12%

Behavioral Health5%–10%

Blood & Lymphoreticular / Immune Systems5%–10%

Gastrointestinal System5%–10%

Nervous System & Special Senses5%–10%

Respiratory System5%–10%

Multisystem Processes & Disorders4%–8%

Endocrine System3%–7%

Pregnancy, Childbirth & the Puerperium3%–7%

Biostatistics & Epidemiology / Population Health3%–5%

Human Development2%–4%

Core Clinical Tasks & Competencies

Prioritizing next best diagnostic test vs immediate therapeutic intervention
Managing acute medical, pediatric, and surgical emergencies in the ED and ICU
Implementing USPSTF-recommended screening guidelines and vaccination schedules
Quality improvement, patient safety protocols, root cause analysis, and clinical ethics

Practice Step 2 CK Vignettes

Overview Official Criteria

Third-Year Clerkship100% Ambulatory / Outpatient Clinical Setting

Ambulatory Care Subject Examination

NBME Outline

Outpatient medicine across general adult and elderly populations, focusing on longitudinal disease management, symptom differentiation, chronic condition titration, and evidence-based preventive screenings.

Testing Format: 110 items • 2 hours 45 minutes (EPC scale 0–100)

Sites of Care: 100% Ambulatory / Outpatient Clinical Setting

Patient Demographics: Adult (60%–70%), Geriatric (20%–25%), Pediatric (10%–15%)

Complete Official Blueprint Specifications17 Metrics

Organ System Blueprint Specifications

Cardiovascular System10%–15%

Respiratory System10%–15%

Musculoskeletal System10%–15%

Endocrine & Metabolic Disorders8%–12%

General Principles, Normal Age-Related Findings & Well Patient5%–10%

Behavioral Health5%–10%

Gastrointestinal System5%–10%

Renal & Urinary System5%–10%

Nervous System & Special Senses5%–10%

Blood & Lymphoreticular System1%–5%

Immune System1%–5%

Skin & Subcutaneous Tissue1%–5%

Social Sciences (Communication, Medical Ethics)1%–5%

Core Clinical Tasks & Competencies

Evaluation of undifferentiated outpatient symptoms (cough, chest pain, fatigue, joint swelling)
Management of chronic hypertension, type 2 diabetes mellitus, hyperlipidemia & osteoarthritis
Implementing USPSTF age- and sex-stratified screening guidelines & adult immunization schedules
Cost-conscious diagnostic test ordering and avoidance of low-value clinical interventions

Practice Ambulatory Care Vignettes

Official Criteria

Third-Year ClerkshipInpatient Floors (40%–45%)

Clinical Neurology Subject Examination

NBME Outline

Neurologic localization, neuromuscular pathology, acute stroke protocols, epilepsy, cognitive impairment, and outpatient neuro-pharmacology across inpatient and ambulatory settings.

Testing Format: 110 items • 2 hours 45 minutes (EPC scale 0–100)

Sites of Care: Inpatient Floors (40%–45%), Ambulatory Clinic (35%–40%), Emergency Department (15%–20%)

Patient Demographics: Adult (65%–75%), Geriatric (20%–25%), Pediatric (5%–10%)

Complete Official Blueprint Specifications11 Metrics

Organ System Blueprint Specifications

Nervous System & Special Senses60%–65%

Musculoskeletal System10%–15%

Multisystem Processes & Disorders5%–10%

Behavioral Health & Neuropsychiatry3%–7%

Cardiovascular System (Vascular / Stroke)3%–7%

General Principles, Age-Related Findings & Well Patient1%–5%

Social Sciences1%–5%

Core Clinical Tasks & Competencies

Neuroanatomic lesion localization (cortex, subcortical, brainstem, spinal cord, nerve, NMJ)
Management of acute ischemic stroke, tPA/thrombectomy inclusion/exclusion & hemorrhage triage
Classification and pharmacological selection for focal vs generalized seizure disorders
Evaluation of movement disorders (Parkinson, essential tremor), demyelinating disease & myasthenia

Practice Neurology Vignettes

Official Criteria

Third-Year ClerkshipAmbulatory Primary Care (85%–90%)

Family Medicine Modular Subject Examination

NBME Outline

Comprehensive primary care covering acute undifferentiated illnesses, chronic disease stabilization, maternal-child health, and preventive surveillance across all age brackets.

Testing Format: 100–110 items (Core + Modular Sections) • 2 hours 45 minutes (EPC scale 0–100)

Sites of Care: Ambulatory Primary Care (85%–90%), Urgent / Inpatient (10%–15%)

Patient Demographics: Pediatric (15%–20%), Adult (50%–55%), Geriatric (25%–30%)

Complete Official Blueprint Specifications11 Metrics

Core Clinical Domain Specifications

Chronic Disease Management (HTN, Diabetes, COPD, Lipids)25%–30%

Health Maintenance, USPSTF Screening & Immunizations20%–25%

Acute Undifferentiated Illness & Triage15%–20%

Musculoskeletal & Sports-Related Injuries10%–15%

Behavioral Health across Lifespan10%–15%

Maternal Health & Care of the Well Child5%–10%

Healthcare Systems, Communication & Ethics3%–7%

Core Clinical Tasks & Competencies

Diagnostic workup of initial presenting symptoms (fatigue, rash, joint pain, abdominal cramps)
Management of metabolic syndrome, diabetes regimens, glycemic targets & statin indications
Well-child examinations, milestone surveillance, and developmental red flags
Shared decision-making for prostate, breast, colorectal, and cervical cancer screenings

Practice Family Medicine Vignettes

Official Criteria

Third-Year ClerkshipInpatient Medical Floors (40%–45%)

Medicine Subject Examination (Internal Medicine)

NBME Outline

Adult inpatient and outpatient internal medicine subspecialties, complex multi-organ disease processes, diagnostic lab interpretation, and inpatient pharmacology.

Testing Format: 100 items • 2 hours 30 minutes (or 110 items • 2h 45m) (EPC scale 0–100)

Sites of Care: Inpatient Medical Floors (40%–45%), Ambulatory Clinic (35%–40%), Emergency Department (20%–25%)

Patient Demographics: Adult (70%–80%), Geriatric (20%–30%)

Complete Official Blueprint Specifications18 Metrics

Organ System Blueprint Specifications

Cardiovascular System12%–16%

Respiratory System10%–15%

Gastrointestinal System & Hepatology10%–14%

Renal & Urinary System8%–12%

Endocrine System & Metabolism8%–12%

Blood & Lymphoreticular System6%–10%

Nervous System & Special Senses6%–10%

Musculoskeletal & Rheumatology / Connective Tissue6%–10%

Multisystem Processes (Shock, Sepsis, Toxins)6%–10%

Infectious Diseases6%–10%

Behavioral Health3%–7%

Immune System2%–5%

Skin & Subcutaneous Tissue2%–5%

Social Sciences2%–5%

Core Clinical Tasks & Competencies

Differential diagnosis for complex multimorbid inpatient admissions
Management of acute decompensated heart failure, ACS, COPD exacerbation & PE
Acid-base interpretation, anion gap calculation, and renal failure etiology differentiation
Antimicrobial stewardship, empiric hospital-acquired coverage & infectious disease de-escalation

Practice Internal Medicine Vignettes

Official Criteria

Third-Year ClerkshipAmbulatory Clinic (70%–75%)

Obstetrics and Gynecology Subject Examination

NBME Outline

Maternal-fetal medicine, labor and delivery complications, reproductive endocrinology, gynecologic oncology, contraception, and primary women’s healthcare.

Testing Format: 110 items • 2 hours 45 minutes (EPC scale 0–100)

Sites of Care: Ambulatory Clinic (70%–75%), Labor & Delivery / Inpatient (20%–25%), Emergency (5%–10%)

Patient Demographics: Reproductive Age Female (80%–85%), Postmenopausal Female (15%–20%)

Complete Official Blueprint Specifications9 Metrics

Primary Clinical Domain Specifications

Obstetrics (Antepartum, Intrapartum, Postpartum, Fetal Monitoring)45%–50%

Gynecology (Benign Gyn, Pelvic Pain, Gyn Oncology, Infertility)45%–50%

Endocrine System & Reproductive Endocrinology5%–10%

Multisystem Processes & Disorders3%–7%

Social Sciences, Ethics & Patient Communication2%–5%

Core Clinical Tasks & Competencies

Interpretation of electronic fetal monitoring strips (Category I, II, III) & labor arrest
Management of hypertensive disorders of pregnancy (preeclampsia, eclampsia, HELLP syndrome)
Differential diagnosis of abnormal uterine bleeding across premenopausal and postmenopausal women
Workup of adnexal masses, pelvic inflammatory disease, ectopic pregnancy, and ovarian torsion

Practice OB/GYN Vignettes

Official Criteria

Third-Year ClerkshipAmbulatory / Outpatient Clinic (65%–70%)

Pediatrics Subject Examination

NBME Outline

Normal growth and development, neonatal transition, pediatric infectious illnesses, congenital disorders, pediatric emergency stabilization, and adolescent health.

Testing Format: 110 items • 2 hours 45 minutes (EPC scale 0–100)

Sites of Care: Ambulatory / Outpatient Clinic (65%–70%), Emergency Department (20%–25%), Inpatient / NICU (12%–16%)

Patient Demographics: Neonate (<1 mo) 10%–15%, Infant/Toddler (1 mo–2 yr) 25%–30%, Child (3–11 yr) 30%–35%, Adolescent (12–18 yr) 25%–30%

Complete Official Blueprint Specifications17 Metrics

Organ System Blueprint Specifications

General Principles, Normal Growth & Development, Well Child15%–20%

Respiratory System (Asthma, Bronchiolitis, Croup, Pneumonia)12%–16%

Gastrointestinal System & Pediatric Nutrition10%–14%

Cardiovascular System (Congenital Heart Defects, Murmurs)8%–12%

Infectious Diseases & Childhood Immunizations8%–12%

Blood, Lymphoreticular & Pediatric Oncology6%–10%

Nervous System & Neurodevelopmental Disorders6%–10%

Renal, Urinary System & Fluid/Electrolytes5%–9%

Multisystem Processes (Sepsis, Inborn Errors of Metabolism)5%–9%

Musculoskeletal System & Pediatric Orthopedics4%–8%

Behavioral Health & Adolescent Medicine4%–8%

Skin & Subcutaneous Tissue (Pediatric Exanthems)3%–7%

Endocrine Disorders (Growth Failure, DKA)3%–6%

Core Clinical Tasks & Competencies

Developmental milestones surveillance (gross motor, fine motor, language, social)
Management of acute pediatric respiratory distress (croup, bronchiolitis, asthma, epiglottitis)
Workup of pediatric fever without a source, neonatal sepsis rules, and meningitis protocols
Fluid resuscitation, maintenance fluid calculations (Holliday-Segar), and dehydration staging

Practice Pediatrics Vignettes

Official Criteria

Third-Year ClerkshipInpatient Psychiatric Unit (40%–45%)

Psychiatry Subject Examination

NBME Outline

Psychiatric diagnostic criteria (DSM-5-TR), psychopharmacology mechanism and side-effect profiles, addiction medicine, emergency crisis interventions, and psychotherapy modalities.

Testing Format: 110 items • 2 hours 45 minutes (EPC scale 0–100)

Sites of Care: Inpatient Psychiatric Unit (40%–45%), Ambulatory Clinic (40%–45%), Emergency / Consultation-Liaison (15%–20%)

Patient Demographics: Adult (65%–75%), Geriatric (Dementia, Delirium) 15%–20%, Child & Adolescent (10%–15%)

Complete Official Blueprint Specifications9 Metrics

Clinical System & Domain Specifications

Behavioral Health & Psychiatric Disorders65%–70%

Nervous System & Special Senses (Neuropsychiatry, Cognitive)10%–15%

General Principles, Psychosocial Factors & Well Patient5%–10%

Multisystem Processes (Toxicology, Withdrawal, Serotonin Syndrome)5%–10%

Social Sciences (Commitment, Ethics, Capacity, Boundary Issues)2%–5%

Core Clinical Tasks & Competencies

Diagnostic differentiation of major mood disorders (Bipolar I, II, MDD with psychotic features)
Management of acute psychiatric emergencies: suicidality, neuroleptic malignant syndrome & lithium toxicity
Pharmacologic side-effect management (metabolic syndrome, EPS, tardive dyskinesia, QTc prolongation)
Differential diagnosis of cognitive impairment: delirium vs dementia vs depression pseudo-dementia

Practice Psychiatry Vignettes

Official Criteria

Third-Year ClerkshipInpatient Floors & ICU (50%–55%)

Surgery Subject Examination

NBME Outline

General surgery, surgical oncology, trauma resuscitation, preoperative evaluation, postoperative complication management, surgical critical care, and common surgical subspecialties.

Testing Format: 110 items • 2 hours 45 minutes (EPC scale 0–100)

Sites of Care: Inpatient Floors & ICU (50%–55%), OR & PACU (20%–25%), Emergency Department / Trauma (15%–20%), Outpatient Clinic (10%–15%)

Patient Demographics: Adult (70%–75%), Geriatric (20%–25%), Pediatric (5%–10%)

Complete Official Blueprint Specifications16 Metrics

Organ System Blueprint Specifications

Gastrointestinal System & Abdominal Wall20%–25%

Cardiovascular System (Vascular, Aortic, Cardiac)10%–15%

Respiratory System & Thoracic Surgery8%–12%

Multisystem Processes (Trauma, Hemorrhagic Shock, Burns, Sepsis)8%–12%

Blood & Lymphoreticular (Hemostasis, Transfusion, Coagulopathy)5%–10%

Nervous System & Neurosurgery (TBI, Intracranial Bleeds)5%–10%

Musculoskeletal System & Orthopedics3%–7%

Renal & Urinary System (Urology)3%–7%

Female Reproductive System & Breast Oncology3%–7%

Endocrine Surgery (Thyroid, Parathyroid, Adrenals)3%–7%

Skin & Soft Tissue (Melanoma, Sarcoma, Necrotizing Infections)2%–5%

Immune System & Transplant Surgery1%–5%

Social Sciences, Informed Consent & Surgical Ethics1%–5%

Core Clinical Tasks & Competencies

Acute abdomen triage: appendicitis, cholecystitis, diverticulitis, bowel obstruction & perforation
Advanced trauma life support (ATLS) primary and secondary survey execution and hemorrhagic shock control
Management of postoperative complications: fever workup (5 Ws), wound dehiscence, DVT/PE, atelectasis
Preoperative risk stratification (cardiac, pulmonary, hepatic) and nutritional optimization

Practice Surgery Vignettes

Official Criteria

Fourth-Year Sub-Internship100% Emergency Department & Trauma Resuscitation Bay

Emergency Medicine Advanced Clinical Examination

NBME Outline

Resuscitation protocols, rapid triage, undifferentiated emergency presentations, bedside ultrasound (POCUS), toxidromes, traumatic injuries, and immediate stabilization.

Testing Format: 100 items • 2 hours 15 minutes (EPC scale 0–100)

Sites of Care: 100% Emergency Department & Trauma Resuscitation Bay

Patient Demographics: Adult (65%–70%), Geriatric (20%–25%), Pediatric (10%–15%)

Complete Official Blueprint Specifications13 Metrics

Clinical System Blueprint Specifications

Cardiovascular Emergencies (ACS, Dysrhythmias, Aortic Dissection)15%–20%

Respiratory Emergencies (PE, Respiratory Failure, Asthma/COPD, PTX)15%–20%

Multisystem Processes (Trauma Resuscitation, Shock, Toxicology)15%–20%

Gastrointestinal Emergencies (Acute Abdomen, GI Bleed, Obstruction)10%–15%

Nervous System Emergencies (Stroke/TIA, Status Epilepticus, Altered Mental Status)8%–12%

Musculoskeletal Emergencies (Fractures, Dislocations, Compartment Syndrome)6%–10%

Renal, Genitourinary & Pelvic Emergencies5%–8%

Infectious Diseases & Sepsis Resuscitation5%–8%

Behavioral & Psychiatric Emergencies (Agitation, Overdose)3%–6%

Blood & Immune Emergencies (Anaphylaxis, Bleeding Diatheses)2%–5%

Core Clinical Tasks & Competencies

Rapid airway stabilization, mechanical ventilation induction, and central access placement
Management of acute cardiogenic, septic, hypovolemic, and anaphylactic shock states
Identification of life-threatening toxidromes (anticholinergic, sympathomimetic, cholinergic, opioid)
Triage decision-making: critical care admission vs observation vs safe discharge with follow-up

Practice Emergency Medicine Vignettes

Official Criteria

Fourth-Year Sub-InternshipInpatient Acute Medical Floors (60%–65%)

Advanced Internal Medicine Clinical Examination (Sub-Internship)

NBME Outline

High-acuity inpatient internal medicine ward care, ICU stepdown management, complex diagnostic reasoning in multimorbid patients, and perioperative medical consultations.

Testing Format: 100 items • 2 hours 15 minutes (EPC scale 0–100)

Sites of Care: Inpatient Acute Medical Floors (60%–65%), Intensive Care Unit / Stepdown (25%–30%), Emergency Admission / Triage (10%–15%)

Patient Demographics: Adult (60%–70%), Geriatric (30%–40%)

Complete Official Blueprint Specifications13 Metrics

Clinical System Blueprint Specifications

Cardiovascular Disorders (Refractory Heart Failure, Arrhythmias, Shock)15%–20%

Pulmonary & Critical Care Medicine (ARDS, Severe Sepsis, Ventilators)15%–20%

Renal, Fluid/Electrolyte & Complex Acid-Base Disorders12%–16%

Gastrointestinal, Hepatic & Biliary (Cirrhosis Decompensation, Pancreatitis)10%–14%

Infectious Diseases (Hospital-Acquired, Sepsis, Immunocompromised Host)10%–14%

Hematology & Oncology (Febrile Neutropenia, Hypercalcemia, Coagulopathies)8%–12%

Endocrine Emergencies (DKA, HHS, Adrenal Crisis, Myxedema)6%–10%

Nervous System & Inpatient Delirium / Encephalopathy5%–8%

Multisystem Organ Failure5%–8%

Core Clinical Tasks & Competencies

Managing multi-organ failure, pressor selection, and hemodynamic stabilization on inpatient wards
Evaluation and diagnostic workup of acute kidney injury with complex mixed acid-base disorders
Diagnostic evaluation and antimicrobial escalation for hospital-acquired and opportunistic infections
Comprehensive discharge planning, medication reconciliation, and care transitions for multimorbid patients

Practice Advanced Medicine Vignettes

Official Criteria

Comprehensive MilestoneAmbulatory (50%–55%)

Comprehensive Clinical Science Examination (CCSE)

NBME Outline

Broad clinical readiness milestone mirroring the USMLE Step 2 CK blueprint, assessing integrated clinical reasoning, disease prevention, diagnosis, and management across all medical disciplines.

Testing Format: 4 blocks • 200 questions (Scored on USMLE 3-digit scale)

Sites of Care: Ambulatory (50%–55%), Inpatient (35%–40%), Emergency Department (10%–15%)

Patient Demographics: Comprehensive Lifespan: Pediatric 20%, Adult 60%, Geriatric 20%

Complete Official Blueprint Specifications20 Metrics

Clinical Science Disciplines (Step 2 CK Framework)

Medicine (Internal Medicine)50%–60%

Pediatrics15%–25%

Obstetrics & Gynecology10%–20%

Surgery10%–15%

Psychiatry10%–15%

Core Clinical Tasks & Competencies

Comprehensive multi-specialty clinical reasoning spanning adult medicine, pediatrics, surgery, OB/GYN, and psychiatry
Integration of laboratory findings, imaging, and patient presentation into accurate primary and secondary diagnoses
Prioritizing pharmacotherapy interventions, surgical consults, and procedural choices based on clinical urgency
Execution of preventive care, adult and pediatric immunization schedules, and screening algorithms

Practice CCSE Vignettes

Official Criteria

Comprehensive MilestoneHealth System Enterprise-wide (Inpatient

Health Systems Science Subject Examination

NBME Outline

Patient safety culture, root cause analysis, healthcare economics and financing, high-value care principles, clinical informatics, population health, and interprofessional teamwork (developed in partnership with the AMA).

Testing Format: 100 items • 2 hours 15 minutes (EPC scale 0–100, developed with AMA)

Sites of Care: Health System Enterprise-wide (Inpatient, Ambulatory, Public Health, Community)

Patient Demographics: All Clinical Populations & Vulnerable Groups

Complete Official Blueprint Specifications12 Metrics

Core & Cross-Cutting Domains (AMA Curriculum)

High-Value Care & Patient Safety (Error Disclosure, RCA)23%–27%

Evidence-Based Practice & Information Mastery18%–22%

Health Care Structures & Processes (Care Models, Payment)13%–17%

Quality Improvement (PDSA Cycles, Run Charts, Six Sigma)13%–17%

Health Care Economics & Policy (Insurance, Financing)8%–12%

Clinical Informatics & EHR (Decision Support, Safety)8%–12%

Population & Public Health (SDOH, Health Inequities)5%–10%

Leadership & Teamwork (Interprofessional Practice)5%–10%

Core Clinical Tasks & Competencies

Performing root cause analysis (RCA) and Swiss Cheese Model event deconstructions following adverse safety events
Designing Plan-Do-Study-Act (PDSA) quality improvement cycles and reading statistical process control run charts
Evaluating diagnostic test characteristics: sensitivity, specificity, positive/negative predictive values & likelihood ratios
Navigating health insurance structures (Medicare, Medicaid, commercial), value-based purchasing, and ACO frameworks

Practice Health Systems Vignettes

Official Criteria

Examination Architecture

How NBME Shelf Exam Criteria Are Structured

NBME builds subject examination forms according to strict multidimensional blueprint constraints. Every official content outline specifies target distributions across four interlocking domains:

1. Organ System Blueprints

Every NBME and USMLE examination form is calibrated to precise percentage allocations across cardiovascular, respiratory, gastrointestinal, neuro/special senses, musculoskeletal, reproductive, endocrine, renal, hematologic, and multisystem domains.

2. Physician Competencies & Tasks

Vignette items rigorously assess clinical practice duties: Foundational Science Application, Diagnostic Acumen (history/physical/diagnostic testing), Pharmacotherapy & Interventions, and Health Maintenance / Disease Prevention.

3. Sites of Care

Vignettes reflect realistic clinical practice settings according to strict target ratios: Ambulatory Outpatient Clinics (35%–100%), Inpatient Hospital Wards & ICUs (15%–65%), and Emergency Departments / Trauma Resuscitation Bays (10%–100%).

4. Patient Age & Demographics

Forms balance clinical scenarios across defined age stratifications: Neonates (<1 mo), Infants/Toddlers (1 mo–2 yr), Children (3–11 yr), Adolescents (12–18 yr), General Adults (19–64 yr), and Geriatric Populations (≥65 yr).

Penziv models all vignette generators, distractor plausibility algorithms, and anchor remediation flows to reflect these exact four dimensions.

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Pre-Clinical Medical Sciences (Year 1 & 2)

NBME Basic Science Subject Examinations

For pre-clinical medical students (M1 & M2) or foundational science reviews, NBME also administers standardized subject exams in Gross Anatomy, Behavioral Science, Biochemistry, Histology & Cell Biology, Microbiology, Neuroscience, Pathology, Pharmacology, and Physiology.

Explore Basic Science Directory

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USMLE Step & NBME Shelf Exam Topics, Criteria & Blueprints

USMLE Board StepsStep 1 & 2 CK

Core Clerkships8 Specialties

Full Blueprint220+ Metrics

Criteria Standard100% Extracted