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INTRODUCTION

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 seconds

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

< 30 mg/g creatinine

< 3.4 mg/mmol creatinine

        Microalbuminuria

30-300 mg/g creatinine

3.4-34 mg/mmol creatinine

        Proteinuria

> 300 mg/g creatinine

> 34 mg/mmol creatinine

    or

or

    Normal

        Male

< 18 mg/g creatinine

0.113

< 2.0 mg/mmol creatinine

        Female

< 25 mg/g creatinine

0.113

< 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

> 180 mg/g creatinine

0.113

> 20 mg/mmol creatinine

        Female

> 250 mg/mmol creatinine

0.113

> 28 mg/mmol creatinine

Alcohol

    See under Ethanol

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

0.63-2.10 μkat/L

α-Fetoprotein (AFP)

< 15 ng/mL

1

< 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

≤ 8 mg/L

1.71

≤ 13.7 μmol/L

Amitriptyline

80-200 ng/mL or mcg/L

3.605

288-721 nmol/L

Ammonia (plasma)

15-56 mcg/dL

0.5872

9-33 pmol/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

< 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

5.1-18.8 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 kPa

    HCO3

22-26 mEq/L

1

22-26 mmol/L

    O2 saturation

≥ 95%

0.01

≥ 0.95

Blood urea nitrogen (BUN)

8-25 mg/dL

0.357

2.9-8.9 mmol/L

B-type natriuretic peptide (BNP)

0-99 pg/mL

1

0-99 ng/L

0.289

0-29 pmol/L

B-type natriuretic peptide, N-terminal fragment (NT-proBNP)

0-299 pg/mL

...

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