USMLE Laboratory Values
SERUM
Hepatic:
Alanine aminotransferase (ALT) 10–40 U/L 10–40 U/L
Aspartate aminotransferase (AST) 12–38 U/L 12–38 U/L
Alkaline phosphatase 25–100 U/L 25–100 U/L
Amylase 25–125 U/L 25–125 U/L
Bilirubin, Total // Direct 0.1–1.0 mg/dL // 0.0–0.3 mg/dL 2–17 μmol/L // 0–5 μmol/L
Proteins, total 6.0–7.8 g/dL 60–78 g/L
Albumin 3.5–5.5 g/dL 35–55 g/L
Globulin 2.3–3.5 g/dL 23–35 g/L
Coagulation:
Partial thromboplastin time (PTT) (activated) 25–40 seconds 25–40 seconds
Prothrombin time (PT) 11–15 seconds 11–15 seconds
D-Dimer ≤250 ng/mL ≤1.4 nmol/L
Lipids:
Cholesterol
Total Normal: <200 mg/dL <5.2 mmol/L
High: >240 mg/dL >6.2 mmol/L
HDL 40–60 mg/dL 1.0–1.6 mmol/L
LDL <160 mg/dL <4.2 mmol/L
Triglycerides Normal: <150 mg/dL <1.70 mmol/L
Borderline: 151–199 mg/dL 1.71–2.25 mmol/L
General Chemistry:
Urea nitrogen 7–18 mg/dL 2.5–6.4 mmol/L
Creatinine 0.6–1.2 mg/dL 53–106 μmol/L
Electrolytes
Sodium (Na+) 136–146 mEq/L 136–146 mmol/L
Potassium (K+) 3.5–5.0 mEq/L 3.5–5.0 mmol/L
Chloride (Cl–) 95–105 mEq/L 95–105 mmol/L
Bicarbonate (HCO3
–) 22–28 mEq/L 22–28 mmol/L
Glucose Fasting: 70–100 mg/dL 3.8–5.6 mmol/L
Calcium 8.4–10.2 mg/dL 2.1–2.6 mmol/L
Magnesium (Mg2+) 1.5–2.0 mg/dL 0.75–1.0 mmol/L
Phosphorus (inorganic) 3.0–4.5 mg/dL 1.0–1.5 mmol/L
Iron Studies:
Ferritin Male: 20–250 ng/mL 20–250 μg/L
Female: 10–120 ng/mL 10–120 μg/L
Iron Male: 65–175 μg/dL 11.6–31.3 μmol/L
Female: 50–170 μg/dL 9.0–30.4 μmol/L
Total iron-binding capacity 250–400 μg/dL 44.8–71.6 μmol/L
Transferrin 200–360 mg/dL 2.0–3.6 g/L