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USMLE Laboratory Values
Find a list of normal ranges of laboratory values commonly tested on USMLE examinations.
Serum
| General Chemistry | Reference Range | Reference Intervals |
|---|---|---|
| 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/ |
| Urea nitrogen | 7–18 mg/dL | 2.5–6.4 mmol/L |
| Creatinine | 0.6–1.2 mg/dL | 53–106 μmol/L |
| Glucose Fasting:
Random, non-fasting: |
70–100 mg/dL
<140 mg/dL |
3.8–5.6 mmol/L
<7.77 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 |
| Hepatic | Reference Range | Reference Intervals |
|---|---|---|
| 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 |
| Lipids | Reference Range | Reference Intervals |
|---|---|---|
| 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 |
| Iron | Reference Range | Reference Intervals |
|---|---|---|
| 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 |
| Endocrine | Reference Range | Reference Intervals |
|---|---|---|
| Hemoglobin A1c | ≤6% | ≤42 mmol/mo |
| Follicle-stimulating hormone | ||
| Male: | 4–25 mIU/mL | 4–25 IU/L |
| Female:
premenopause |
4–30 mIU/mL | 4–30 IU/L |
| midcycle peak | 10–90 mIU/mL | 10–90 IU/L |
| postmenopause | 40–250 mIU/mL | 40–250 IU/L |
| Luteinizing hormone | ||
| Male: | 6–23 mIU/mL | 6–23 IU/L |
| Female:
follicular phase |
5–30 mIU/mL | 5–30 IU/L |
| midcycle | 75–150 mIU/mL | 75–150 IU/L |
| postmenopause | 30–200 mIU/mL | 30–200 IU/L |
| Growth hormone
Arginine stimulation Fasting: |
<5 ng/mL | <5 μg/L |
| Provocative stimuli: | >7 ng/mL | >7 μg/L |
| Prolactin (hPRL)
Male: |
<17 ng/mL | <17 μg/L |
| Female: | <25 ng/mL | <25 μg/L |
| Cortisol
Female |
<25 ng/mL | <25 μg/L |
| 0800 h:
|
5–23 μg/dL | 138–635 nmol/L |
| 1600 h: | 3–15 μg/dL | 82–413 nmol/L |
| 2000 h: | 2000 h: <50% of 0800 h | Fraction of 0800 h: <0.50 |
| TSH
|
0.4–4.0 μU/mL | 0.4–4.0 mIU/L |
| Triiodothyronine (T3) (RIA) | 100–200 ng/dL | 1.5–3.1 nmol/L |
| Triiodothyronine (T3) resin uptake | 25%–35% | 0.25–0.35 |
| Thyroxine (T4) | 5–12 μg/dL | 64–155 nmol/L |
| Free T4 | 0.9–1.7 ng/dL | 12.0–21.9 pmol/L |
| Thyroidal iodine (123I) uptake | 8%–30% of administered dose/ | 24 h 0.08–0.30/24 h |
| PTH intact | 10–60 pg/mL | 10–60 ng/L |
| 17-Hydroxycorticosteroids
Male: |
3.0–10.0 mg/24 h | 8.2–27.6 μmol/24 h |
| Female:
|
2.0–8.0 mg/24 h | 5.5–22.0 μmol/24 h |
| 17-Ketosteroids, total
Male: |
8–20 mg/24 h | 28–70 μmol/24 h |
| Female: | 6–15 mg/24 h | 21–52 μmol/24 |
| Inmunoglobulins | Reference Range | Reference Intervals |
|---|---|---|
| IgA | 76–390 mg/dL | 0.76–3.90 g/L |
| IgE | 0–380 IU/mL | 0–380 kIU/L |
| IgG | 650–1500 mg/dL | 6.5–15.0 g/L |
| IgM | 50–300 mg/dL | 0.5–3.0 g/L |
| Reference Range | Reference Intervals | |
|---|---|---|
| Creatinine clearance
Male: |
97–137 mL/min | 97–137 mL/min |
| Female: | 88–128 mL/min | 88–128 mL/min |
| Creatine kinase
Male: |
25–90 U/L | 25–90 U/L |
| Female: | 10–70 U/L | 10–70 U/L |
| Lactate dehydrogenase | 45–200 U/L | 45–200 U/L |
| Osmolality | 275–295 mOsmol/kg H2O | 275–295 mOsmol/kg H2O |
| Uric acid | 3.0–8.2 mg/dL | 0.18–0.48 mmol/L |
| Urine | Reference Range | Reference Intervals |
|---|---|---|
| Calcium | 100–300 mg/24 h | 2.5–7.5 mmol/24 h |
| Osmolality | 50–1200 mOsmol/kg H2O | 50–1200 mOsmol/kg H2O |
| Oxalate | 8–40 μg/mL | 90–445 μmol/L |
| Proteins, total | <150 mg/24 h | <0.15 g/24 h |
| Reference Range | Reference Intervals | |
|---|---|---|
| PO2 | 75–105 mm Hg | 10.0–14.0 kPa |
| PCO2 | 33–45 mm Hg | 4.4–5.9 kPa |
| pH | 7.35–7.45 [H+] | 36–44 nmol/L |
| Cerebrospinal Fluid (CSF) | Reference Range | Reference Intervals |
|---|---|---|
| Cell count | 0–5/mm3 | 0–5 × 106/L |
| Chloride | 118–132 mEq/L | 118–132 mmol/L |
| Gamma globulin | 3%–12% total proteins | 0.03–0.12 |
| Glucose | 40–70 mg/dL | 2.2–3.9 mmol/L |
| Pressure | 70–180 mm H2O | 70–180 mm H2O |
| Proteins, total | <40 mg/dL | <0.40 g/L |
| Complete Blood Count: | Reference Range | Reference Intervals |
|---|---|---|
| Hematocrit
Male: |
41%–53% | 0.41–0.53 |
| Female: | 36%–46% | 0.36–0.46 |
| Hemoglobin, blood
Male: |
13.5–17.5 g/dL | 135–175 g/L |
| Female: | 12.0–16.0 g/dL | 120–160 g/L |
| Mean corpuscular hemoglobin (MCH) | 25–35 pg/cell | 0.39–0.54 fmol/cell |
| Mean corpuscular hemoglobin conc. (MCHC) | 31%–36% Hb/cell | 4.8–5.6 mmol Hb/L |
| Mean corpuscular volume (MCV) | 80–100 μm3 | 80–100 fL |
| Volume
Plasma Male: |
25–43 mL/kg | 0.025–0.043 L/kg |
| Female: | 28–45 mL/kg | 0.028–0.045 L/kg |
| Red cell
Male: |
20–36 mL/kg | 0.020–0.036 L/kg |
| Female: | 19–31 mL/kg | 0.019–0.031 L/kg |
| Leukocyte count (WBC) | 4500–11,000/mm3 | 4.5–11.0 × 109/L |
| Neutrophils, segmented | 54%–62% | 0.54–0.62 |
| Neutrophils, bands | 3%–5% | 0.03–0.05 |
| Lymphocytes | 25%–33% | 0.25–0.33 |
| Monocytes | 3%–7% | 0.03–0.07 |
| Eosinophils | 1%–3% | 0.01–0.03 |
| Basophils | 0%–0.75% | 0.00–0.0075 |
| Platelet count | 150,000–400,000/mm3 | 150–400 × 109/L |
| Coagulation | Reference Range | Reference Intervals |
|---|---|---|
| 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 |
| Reference Range | Reference Intervals | |
|---|---|---|
| Reticulocyte count | 0.5%–1.5% | 0.005–0.015 |
| Erythrocyte count
Male: |
4.3–5.9 million/mm3 | 4.3–5.9 × 1012/L |
| Female: | 3.5–5.5 million/mm3 | 3.5–5.5 × 1012/L |
| Erythrocyte sedimentation rate (Westergren)
Male: |
0–15 mm/h | 0–15 mm/h |
| Female: | 0–20 mm/h | 0–20 mm/h |
| CD4+ T-lymphocyte count | ≥500/mm3 | ≥0.5 × 109/L |
| Troponin I | ≤0.04 ng/mL | ≤0.04 μg/L |