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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 SI units and conventional units are reported.

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Laboratory Conventional Units Conversion Factor SI Units
Acid phosphatase      
 Male 2–12 units/L 16.7 33–200 nkat/L
 Female 0.3–9.2 units/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 IU/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)      
 Normal <30 mg/g creatinine    
 Microalbuminuria 30–300 mg/g creatinine    
 Proteinuria >300 mg/g creatinine    
or or    
 Normal      
  Male <2.0 mg/mmol creatinine    
  Female <2.8 mg/mmol creatinine    
 Microalbuminuria      
  Male 2.0–20 mg/mmol creatinine    
  Female 2.8–28 mg/mmol creatinine    
 Proteinuria      
  Male >20 mg/mmol creatinine    
  Female >28 mg/mmol creatinine    
Aldosterone      
 Supine <16 ng/dL 27.7 <444 pmol/L
 Upright <31 ng/dL 27.7 <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
 >20 years 38–126 IU/L 0.01667 0.13–2.10 μkat/L
Alpha-fetoprotein (AFP) <15 ng/mL 1 <15 mcg/L
Alpha1-antitrypsin 80–200 mg/dL 0.01 0.8–2.0 g/L
Amikacin, therapeutic 15–30 mg/L peak 1.71 25.6–51.3 μmol/L peak
  ≤8 mg/L trough   ≤13.7 μmol/L trough
Amitriptyline 80–200 ng/mL or mcg/L 3.4 272–680 nmol/L
Ammonia (plasma) 15.33–56.20 mcg NH3/dL 0.5872 9–33 μmol NH3/L
Amylase 25–115 IU/L 0.01667 0.42–1.92 kat/L
Androstenedione 50–250 ng/dL 0.0349 1.7–8.7 nmol/L
Angiotensin-converting enzyme 15–70 units/L 16.67 250–1,167 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
Beta2-microglobulin <0.2 mg/dL 10 2 mg/L
Bicarbonate 22–26 mEq/L 1 22–26 mmol/L
Bilirubin      
 Total 0.3–1.1 mg/dL 17.1 5.13–18.80 μmol/L
 Direct 0–0.3 mg/dL 17.1 0–5.1 μmol/L
 Indirect 0.1–1.0 mg/dL 17.1 1.71–17.1 μmol/L
Bleeding time 3–7 min    
Blood gases (arterial)      
 pH 7.35–7.45 1 7.35–7.45
 PaO2 80–105 mm Hg 0.133 10.6–14.0 kPa
 PaCO2 35–45 mm Hg 0.133 4.7–6.0 kPa
 HCO3 22–26 mEq/L 1

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