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Laboratory Values

View NBME lab values in a desktop or mobile-friendly format or download the PDF.

General Chemistry

	Reference Range	SI 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/L
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: 70–100 mg/dL Random, non-fasting: <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/L

Hepatic

	Reference Range	SI 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
Bilirubin, total // direct	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

Other, Serum

	Reference Range	SI Reference Intervals
Amylase	25–125 U/L	25–125 U/L
Lipase	13–60 U/L	13–60 U/L
Creatinine clearance	Male: 97–137 mL/min Female: 88–128 mL/min	97–137 mL/min 88–128 mL/min
Creatine kinase	Male: 25–90 U/L Female: 10–70 U/L	25–90 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
Troponin I	≤0.04 ng/mL	≤0.04 µg/L
Uric acid	3.0–8.2 mg/dL	0.18–0.48 mmol/L

Lipids

	Reference Range	SI Reference Intervals
Cholesterol
Total	Normal: <200 mg/dL High: >240 mg/dL	<5.2 mmol/L >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 Borderline: 151–199 mg/dL	<1.70 mmol/L 1.71–2.25 mmol/L

Iron Studies

	Reference Range	SI Reference Intervals
Ferritin	Male: 20–250 ng/mL Female: 10–120 ng/mL	20–250 μg/L 10–120 μg/L
Iron	Male: 65–175 µg/dL Female: 50–170 μg/dL	11.6–31.3 μmol/L 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	SI Reference Intervals
Follicle-stimulating hormone	Male: 4–25 mIU/mL Female: premenopause 4–30 mIU/mL midcycle peak 10–90 mIU/mL postmenopause 40–250 mIU/mL	4–25 IU/L 4–30 IU/L 10–90 IU/L 40–250 IU/L
Luteinizing hormone	Male: 6–23 mIU/mL Female: follicular phase 5–30 mIU/mL midcycle 75–150 mIU/mL postmenopause 30–200 mIU/mL	6–23 IU/L 5–30 IU/L 75–150 IU/L 30–200 IU/L
Growth hormone - arginine stimulation	Fasting: <5 ng/mL <5 μg/L Provocative stimuli: >7 ng/mL >7 μg/L	<5 μg/L >7 μg/L
Prolactin (hPRL)	Male: <17 ng/mL Female: <25 ng/mL	<17 μg/L <25 μg/L
Cortisol	0800 h: 5–23 μg/dL 1600 h: 3–15 μg/dL 2000 h: <50% of 0800 h	138–635 nmol/L 82–413 nmol/L 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
Intact PTH	10–60 pg/mL	10–60 ng/L
17-Hydroxycorticosteroids	Male: 3.0–10.0 mg/24 h Female: 2.0–8.0 mg/24 h	8.2–27.6 μmol/24 h 5.5–22.0 μmol/24 h
17-Ketosteroids, total	Male: 8–20 mg/24 h Female: 6–15 mg/24 h	28–70 μmol/24 h 21–52 μmol/24 h

Immunoglobulins

	Reference Range	SI 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	SI 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

	Reference Range	SI 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	SI Reference Intervals
Hematocrit	Male: 41%–53% Female: 36%–46%	0.41–0.53 0.36–0.46
Hemoglobin, blood	Male: 13.5–17.5 g/dL Female: 12.0–16.0 g/dL	135–175 g/L 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 Female: 28–45 mL/kg	0.025–0.043 L/kg 0.028–0.045 L/kg
Red cell	Male: 20–36 mL/kg Female: 19–31 mL/kg	0.020–0.036 L/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	SI Reference Intervals
Partial thromboplastin time (PTT/aPTT) (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

Other, Hematologic

	Reference Range	SI Reference Intervals
Reticulocyte count	0.5%–1.5%	0.005–0.015
Erythrocyte count (RBC)	Male: 4.3–5.9 million/mm³ Female: 3.5–5.5 million/mm³	4.3–5.9 × 10¹²/L 3.5–5.5 × 10¹²/L
Erythrocyte sedimentation rate (Westergren)	Male: 0–15 mm/h Female: 0–20 mm/h	0–15 mm/h 0–20 mm/h
CD4+ T-lymphocyte count	≥500/mm³	≥0.5 × 109/L

Endocrine

	Reference Range	SI Reference Intervals
Hemoglobin A_1c	≤6%	≤42 mmol/mol

	Reference Range	SI 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

Adult: 19–25 kg/m2

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