The USMLE confusion pair library
837 pairs of concepts that look alike under exam pressure. Each one shows the single clue that separates them, a side-by-side comparison, and a free practice question.
USMLE Step 1
589 pairs- Pharmacology54 pairs
- Neurology41 pairs
- Biochemistry & Genetics41 pairs
- Embryology & Anatomy39 pairs
- Gastrointestinal38 pairs
- Cardiovascular36 pairs
- Microbiology35 pairs
- Infectious Disease35 pairs
- Hematology & Oncology31 pairs
- Endocrine30 pairs
- Reproductive27 pairs
- Renal & Acid-Base26 pairs
- Behavioral & Public Health24 pairs
- Respiratory22 pairs
- Immunology22 pairs
- Psychiatry21 pairs
- MSK & Rheumatology21 pairs
- Dermatology17 pairs
- Pathology basics15 pairs
- Pediatrics14 pairs
USMLE Step 2 CK beta
248 pairs- Cardiovascular25 pairs
- Pediatrics20 pairs
- Neurology20 pairs
- Gastrointestinal20 pairs
- Infectious Disease19 pairs
- Obstetrics & Gynecology19 pairs
- Respiratory18 pairs
- Hematology & Oncology18 pairs
- Renal & Acid-Base15 pairs
- Endocrine15 pairs
- Psychiatry13 pairs
- MSK & Rheumatology11 pairs
- Primary Care & Geriatrics9 pairs
- Dermatology9 pairs
- Emergency Medicine7 pairs
- Surgery7 pairs
- Behavioral & Public Health3 pairs