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INTRODUCTION

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The following table is an alphabetical listing of some common laboratory tests and their reference ranges for adults as measured in plasma or serum (unless otherwise indicated). Reference values differ among laboratories, so readers should refer to the published reference ranges used in each institution. For some tests, both the Système International Units and Conventional Units are reported.

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Laboratory Test Conventional Units Conversion Factor Système International Units
Acid phosphatase
 Male 2-12 U/L 16.7 33-200 nkat/L
 Female 0.3-9.2 U/L 16.7 5-154 nkat/L
Activated partial thromboplastin time (aPTT) 25-40 sec
Adrenocorticotropic hormone (ACTH) 15-80 pg/mL or ng/L 0.2202 3.3-17.6 pmol/L
Alanine aminotransferase (ALT, SGPT) 7-53 U/L 0.01667 0.12-0.88 μkat/L
Albumin 3.5-5.0 g/dL 10 35-50 g/L
Albumin:creatinine ratio (urine) 0.113
 Normal Less than 30 mg/g creatinine Less than 3.4 mg/mmol creatinine
 Microalbuminuria 30-300 mg/g creatinine 3.4-34 mg/mmol creatinine
 Proteinuria Greater than 300 mg/g creatinine Greater than 34 mg/mmol creatinine
or or
Normal
 Male Less than 18 mg/g creatinine 0.113 Less than 2.0 mg/mmol creatinine
 Female Less than 25 mg/g creatinine 0.113 Less than 2.8 mg/mmol creatinine
Microalbuminuria
 Male 18-180 mg/g creatinine 0.113 2.0-20 mg/mmol creatinine
 Female 25-250 mg/g creatinine 0.113 2.8-28 mg/mmol creatinine
Proteinuria
 Male Greater than 180 mg/g creatinine 0.113 Greater than 20 mg/mmol creatinine
 Female Greater than 250 mg/mmol creatinine 0.113 Greater than 28 mg/mmol creatinine
Alcohol
 See under Ethanol
Aldosterone
 Supine Less than 16 ng/dL 27.7 Less than 444 pmol/L
 Upright Less than 31 ng/dL 27.7 Less than 860 pmol/L
Alkaline phosphatase
 10-15 years 130-550 IU/L 0.01667 2.17-9.17 μkat/L
 16-20 years 70-260 IU/L 0.01667 1.17-4.33 μkat/L
 Greater than 20 years 38-126 IU/L 0.01667 0.63-2.10 μkat/L
α-Fetoprotein (AFP) Less than 15 ng/mL 1 Less than 15 mcg/L
α-1-Antitrypsin 80-200 mg/dL 0.01 0.8-2.0 g/L
Amikacin, therapeutic
 Peak 15-30 mg/L 1.71 25.6-51.3 μmol/L
 Trough Less than or equal to 8 mg/L 1.71 Less than or equal to 13.7 μmol/L
Amitriptyline 80-200 ng/mL or mcg/L 3.605 288-721 nmol/L
Ammonia (plasma) 15-56 mcg NH3/dL 0.5872 9-33 μmol NH3/L
Amylase 25-115 U/L 0.01667 0.42-1.92 μkat/L
Androstenedione 50-250 ng/dL 0.0349 1.7-8.7 nmol/L
Angiotensin-converting enzyme 15-70 units/L 16.67 250-1167 nkat/L
Anion gap 7-16 mEq/L 1 7-16 mmol/L
Anti-double-stranded DNA (anti-ds DNA) Negative
Anti-HAV Negative
Anti-HBc Negative
Anti-HBs Negative
Anti-HCV Negative
Anti-Sm antibody Negative
Antinuclear antibody (ANA) Negative
Apolipoprotein A-1
 Male 95-175 mg/dL 0.01 0.95-1.75 g/L
 Female 100-200 mg/dL 0.01 1.0-2.0 g/L
Apolipoprotein B
 Male 50-110 mg/dL 0.01 0.5-1.10 g/L
 Female 50-105 mg/dL 0.01 0.5-1.05 g/L
Aspartate aminotransferase (AST, SGOT) 11-47 IU/L 0.01667 0.18-0.78 μkat/L
β2-Microglobulin Less than 0.2 mg/dL 10 Less than 2 mg/L
Bicarbonate 22-26 mEq/L 1 22-26 mmol/L
Bilirubin
 Total 0.3-1.1 mg/dL 17.1 5.1-18.8 μmol/L
 Direct 0-0.3 mg/dL 17.1 0-5.1 μmol/L
 Indirect 0.1-1.0 mg/dL 17.1 1.7-17.1 μmol/L
Bleeding time 3-7 minutes 60 180-420 seconds
Blood gases (arterial)
 pH 7.35-7.45 1 7.35-7.45
 Po2 80-105 mm Hg 0.133 10.6-14.0 kPa
 Pco2 35-45 mm Hg 0.133 4.7-6.0 ...

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