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Clinical Chemistry SI Conversion Factors

By Susan E. Fielder, DVM, MS, DACVP (Clinical Pathology), Clinical Assistant Professor, Department of Pathobiology, Center for Veterinary Health Sciences (CVHS), Oklahoma State University

Clinical Chemistry SI Conversion Factors

Measure

Conventional (USA) Units

Conversion Factor (×)

SI Units

Alkaline phosphatase

IU/L

1.0

U/L

ALT

U/L

1.0

U/L

Albumin

g/dL

10.0

g/L

Ammonia (NH4)

mcg/dL

0.5872

μmol/L

Amylase

Somogyi units

1.85

U/L

AST

U/L

1.0

U/L

Bilirubin

mg/dL

17.10

μmol/L

Calcium

mg/dL

0.25

mmol/L

Carbon dioxide

mEq/L

1.0

mmol/L

Chloride

mEq/L

1.0

mmol/L

Cholesterol

mg/dL

0.026

mmol/L

Copper

mcg/dL

0.16

μmol/L

Cortisol

mcg/dL

27.6

nmol/L

CK

IU/L

1.0

U/L

Creatinine

mg/dL

88.40

μmol/L

Fibrinogen

mg/dL

0.01

g/L

Glucose

mg/dL

0.055

mmol/L

Iron, binding

mcg/dL

0.179

μmol/L

Iron, total

mcg/dL

0.179

μmol/L

Lipase

IU/L

1

U/L

Cherry-Crandall U

278

U/L

Magnesium

mEq/L

0.5

mmol/L

Osmolality

Osm/kg

1.0

mmol/L

Phosphorus

mg/dL

0.323

mmol/L

Potassium

mEq/L

1.0

mmol/L

Protein, total

g/dL

10.0

g/L

Sodium

mEq/L

1.0

mmol/L

Triglycerides

mg/dL

0.011

mmol/L

Triiodothyronine (T3)

mcg/dL

15.6

nmol/L

Thyroxine (T4)

mcg/dL

12.87

nmol/L

Urea nitrogen

mg/dL

0.357

mmol/L

Uric acid

mg/dL

0.059

mmol/L

Urine protein/creatinine ratio

g/g

0.113

g/mmol

Xylose absorption

mg/dL

0.067

mmol/L

Adapted from Veterinary Laboratory Medicine: Interpretation and Diagnosis, Meyer DH, Harvey JW, 3rd ed., Copyright 2004, with permission from Elsevier.

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* This is the Veterinary Version. *