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USMLE Laboratory Values

Find a list of normal ranges of laboratory values commonly tested on USMLE examinations.


Serum

General Chemistry
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 ΞΌmol/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 ΞΌmol/L // 0–5 ΞΌmol/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 ΞΌg/L
Female: 10–120 ng/mL 10–120 ΞΌg/L
Iron
Male: 65–175 ΞΌg/dL 11.6–31.3 ΞΌmol/L
Female: 50–170 ΞΌg/dL 9.0–30.4 ΞΌmol/L
Total iron-binding capacity 250–400 ΞΌg/dL 44.8–71.6 ΞΌmol/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 ΞΌg/L
Provocative stimuli: >7 ng/mL >7 ΞΌg/L
Prolactin (hPRL)

Male:

<17 ng/mL <17 ΞΌg/L
Female: <25 ng/mL <25 ΞΌg/L
Cortisol

Female

<25 ng/mL <25 ΞΌg/L
0800 h:


5–23 ΞΌg/dL 138–635 nmol/L
1600 h: 3–15 ΞΌg/dL 82–413 nmol/L
2000 h: 2000 h: <50% of 0800 h Fraction of 0800 h: <0.50
TSH


0.4–4.0 ΞΌU/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 ΞΌg/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 ΞΌmol/24 h
Female:


2.0–8.0 mg/24 h 5.5–22.0 ΞΌmol/24 h
17-Ketosteroids, total

Male:

8–20 mg/24 h 28–70 ΞΌmol/24 h
Female: 6–15 mg/24 h 21–52 ΞΌmol/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 ΞΌg/mL 90–445 ΞΌmol/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 Γ— 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 ΞΌm3 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 Γ— 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 Γ— 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 Γ— 1012/L
Female: 3.5–5.5 million/mm3 3.5–5.5 Γ— 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 β‰₯500/mm3 β‰₯0.5 Γ— 109/L
Troponin I ≀0.04 ng/mL ≀0.04 ΞΌg/L

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