The Medical Algorithms Project       
 
Chapter : ch40. Unit Conversions Section : Unit Conversions

  Conversion of SI to Conventional Units: Blood Chemistries

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Overview :

Results of chemistry tests performed on serum, plasma, whole blood or erythrocytes can be converted between conventional (US) and SI units if the conversion factors are known.

Specimen: serum (S), plasma (P), whole blood (WB) or erythrocytes (RBC)

Test

Speci-men

SIU Units

Factor for Conversion

Conventional Units

11-Deoxycorticosterone (DOC)

S

pmol/L

0.33

pg/mL

Acetone

S

µmol/L

0.0058

mg/dL

Acid phosphatase, prostatic

S

U/L

1

U/L

Acid phosphatase, prostatic

S

U/L at 37° C

0.06

Bessey-Lowry-Brock U/L at 37° C

Adrenocorticotropic hormone (ACTH)

S

ng/L

1

pg/mL

Adrenocorticotropic hormone ACTH)

S

pmol/L

4.541

pg/mL

Alanine amino-transferase (ALT, SGPT)

S

U/L at 37° C

1

U/L at 37° C

Alanine amino-transferase (ALT, SGPT)

S

µKat/L

58.82

U/L at 37° C

Albumin

S

g/L

0.1

g/dL

Aldolase

S

U/L at 37° C

1.35

Sibley-Lehninger U/L at 37° C

Aldolase

S

µKat/L

58.82

U/L

Aldosterone

S

nmol/L

36.1

ng/dL

Alkaline phosphatase

S

U/L

0.14

King-Armstrong units/dL

Alkaline phosphatase

S

µKat/L

58.82

U/L

Alkaline phosphatase

S

U/L at 37° C

1

Babson U/L at 37° C

alpha-1 Antitrypsin

S

g/L

100

mg/dL

alpha-Fetoprotein (AFP)

S

µg/L

1

ng/mL

alpha-Fetoprotein (AFP)

S

ng/L

0.1

ng/dL

alpha-Fetoprotein (AFP)

S

g/L

100

mg/dL

alpha-Fetoprotein (AFP)

S

mg/L

0.1

mg/dL

alpha-Fetoprotein (AFP)

S

µg/L

0.1

µg/dL

Ammonia

P

µmol NH3/L

1.703

µg NH3/dL

Ammonia

P

µmol N/L

1.4

µg N/dL

Amylase

S

U/L

0.541

Somogyi (saccharogenic) U/dL

Amylase

S

µKat/L

58.82

U/L

Androstenedione

S

pmol/L

0.0286

ng/dL

Angiotensin converting enzyme (ACE)

S

U/L

1

nmol/min/mL

Angiotensin II

S

ng/L

0.1

ng/dL

Anion gap

S

mmol/L

1

mEq/L

Antidiuretic hormone (ADH)

S

ng/L

1

pg/mL

Apolipoprotein A1

S

mg/L

0.1

mg/dL

Apolipoprotein B

S

mg/L

0.1

mg/dL

Aspartate amino-transferase (AST, SGOT)

S

U/L at 37° C

1

U/L at 37° C

Aspartate amino-transferase (AST, SGOT)

S

µKat/L

58.82

U/L at 37° C

Base Excess

S

mmol/L

1

mEq/L

Bicarbonate

S

mmol/L

1

mEq/L

Bilirubin

S

µmol/L

0.0584

mg/dL

Calcitonin

S

ng/L

1

pg/mL

Calcium

S

mmol/L

4

mg/dL

Calcium

S

mmol/L

2

mEq/L

Calcium, ionized

S

mmol/L

4

mg/dL

Carbon dioxide partial pressure pCO2

WB

kPa

7.52

mm Hg

Carbon dioxide total

S

mmol/L

1

mEq/L

Carcinoembryonic Antigen (CEA)

S

µg/L

1

ng/mL

Carcinoembryonic Antigen (CEA)

S

mg/L

1

µg/mL

Carotene

S

µmol/L

53.76

µg/dL

Catecholamines, fractionated - epinephrine

P

pmol/L

0.1832

pg/mL

Catecholamines, fractionated - norepinephrine

P

nmol/L

169.49

pg/mL

Ceruloplasmin

S

mg/L

0.1

mg/dL

Chloride

S

mmol/L

1

mEq/L

Chloride

S

mmol/L

1

mg/dL

Cholesterol

S

mmol/L

38.61

mg/dL

Cholinesterase (pseudocholinesterase)

S

U/L at 37° C

1

U/L at 37° C

Copper

S

µmol/L

6.37

µg/dL

Coproporphyrins

S

nmol/L

0.067

µg/dL

Cortisol

S

µmol/L

35.7

µg/dL

Cortisol

S

nmol/L

0.362

ng/mL

Creatine

S

µmol/L

0.0131

mg/dL

Creatine kinase

S

U/L at 37° C

1

U/L at 37° C

Creatine kinase

S

µKat/L

58.82

U/L at 37° C

Creatinine

S

µmol/L

0.0113

mg/dL

Creatinine clearance

S

mL/sec•m^2

104

mL/min/1.73 m^2

cyclic Adenosine monophosphate (cAMP)

S

nmol/L

0.329

µg/L

cyclic Adenosine monophosphate (cAMP)

WB

nmol/L

0.329

ng/mL

Dehydro-epiandrosterone sulfate (DHEA-S)

S

µmol/L

0.38

µg/mL

delta-Aminolevulinic acid

S

µmol/L

0.0131

mg/dL

Ferritin

S

µg/L

1

ng/mL

Folate

S

nmol/L

0.4413

ng/mL

Galactose

WB

mmol/L

18.01

mg/dL

Gamma glutamyl transferase (GGT)

S

U/L at 37° C

1

U/L at 37° C

Gamma glutamyl transferase (GGT)

S

µKat/L

58.82

U/L at 37° C

Gastrin

S

ng/L

1

pg/mL

Glucose

S

mmol/L

18.02

mg/dL

Glutathione

WB

mmol/L

30.77

mg/dL

Growth hormone

S

µg/L

1

ng/mL

Haptoglobin

S

g/L

100

mg/dL

HDL-cholesterol

S

mmol/L

38.61

mg/dL

Human chorionic gonadotropin (HCG), beta-subunit

S

IU/L

1

mU/mL

Hydroxybutyric dehydrogenase

S

kU/L

1

U/mL

Insulin

P

pmol/L

0.143988

µIU/mL

Iron

S

µmol/L

5.587

µg/dL

Iron binding capacity

S

µmol/L

5.587

µg/dL

Iron saturation

S

fraction saturation

100

%

Isocitrate dehydrogenase (ICD)

S

U/L at 25° C

59.88

Wolfson-Williams-Ashman units/mL at 25° C

Isocitrate dehydrogenase (ICD)

S

µKat/L

58.82

U/L

Lactate

S

mmol/L

9.01

mg/dL

Lactate dehydrogenase (LD)

S

U/L at 30° C

2.07

Wroblewski units/mL at 30° C

Lactate dehydrogenase (LD)

S

U/L at 37° C

1

U/L at 37° C

LDL-cholesterol

S

mmol/L

38.61

mg/dL

Lead

S

µmol/L

20.72

µg/dL

Lead

S

µmol/L

0.0207

mg/dL

Leucine aminopeptidase (LAP)

S

U/L

4.1667

Goldbarg-Rutenberg U/mL

Leucine aminopeptidase (LAP)

S

µKat/L

58.82

U/L

Lipase

S

U/L

0.0036

Cherry-Crandal U/mL

LIpase

S

µKat/L

58.82

U/L

Lipids, total

S

g/L

100

mg/dL

Luteinizing hormone (LH)

S

IU/L

1

mIU/mL

Magnesium

S

mmol/L

2

mEq/L

Magnesium

S

mmol/L

2.433

mg/dL

Malic dehydrogenase

S

µKat/L

58.82

U/L

Methemoglobin

WB

g/L

0.1

g/dL

Muramidase

S

mg/L

1

mg/L

Myoglobin

S

µg/L

1

µg/L

Osmolality

S

mOsm/kg H2O

1

mOsm/kg H2O

Osteocalcin

S

µg/L

1

ng/mL

Oxygen partial pressure pO2

WB

kPa

7.5

mm Hg

Parathyroid hormone (PTH)

S

ng/L

1

pg/mL

pH

WB

nmol/L

1

nEq/L

Phenylalanine

S

µmol/L

0.0165

mg/dL

Phosphate, inorganic phosphorus

S

mmol/L

3.1

mg/dL

Porphobilinogen

S

µmol/d

0.226

µg/d

Potassium

S

mmol/L

1

mEq/L

Progesterone

S

nmol/L

31.4465409

ng/dL

Prolactin

S

µg/L

1

ng/mL

Protein, total

S

g/L

0.1

g/dL

Protoporphyrin

RBC

µmol/L

56.27

mg/dL

Pyruvate

WB

µmol/L

0.0088

mg/dL

Renin (plasma renin activity, PRA)

S

µg/L•h

1

ng/ml/h

Reverse T3 (rT3)

S

nmol/L

65.1

ng/dL

Serotonin

S

µmol/L

176

ng/mL

Sodium

S

mmol/L

1

mEq/L

Testosterone

S

nmol/L

28.8

ng/dL

Thyroglobulin

S

µg/L

1

ng/mL

Thyroxine binding globulin (TBG)

S

mg/L

0.1

mg/dL

Thyroxine binding globulin (TBG)

S

µg/L

0.1

µg/dL

Thyroid stimulating hormone (TSH)

S

mIU/L

1

µU/mL

Thyrotropin releasing hormone (TRH)

S

ng/L

1

pg/mL

Thyrotropin releasing hormone (TRH)

S

nmol/L

0.3625

pg/mL

Thyroxine (T4) total

S

nmol/L

0.0775

µg/dL

Thyroxine, free

S

pmol/L

0.0775

ng/dL

Transferrin (TIBC)

S

g/L

100

mg/dL

Tri-iodothyronine (T3), free

S

nmol/L

0.0649

pg/mL

Tri-iodothyronine (T3), total

S

nmol/L

65.1

ng/dL

Triglycerides

S

mmol/L

88.5

mg/dL

Troponin I

S

µg/L

1

mg/mL

Troponin I

S

µg/L

1

µg/L

Troponin T

S

µg/L

1

µg/L

Urea

S

mmol/L

2.8

mg/dL urea nitrogen

Uric acid

S

mmol/L

16.9

mg/dL

Viscosity

S

centipoise

1

centipoise

Vitamin A1

S

µmol/L

28.65

µg/dL

Vitamin B12 (cyanocobalamin)

S

pmol/L

1.355

pg/mL

Vitamin B12, unsaturated binding capacity

S

pmol/L

1.355

pg/mL

Vitamin B6

S

nmol/L

0.1672

ng/mL

Vitamin C (ascorbic acid)

S

µmol/L

0.176

mg/dL

Vitamin D (calciferol, 1,25-dihydroxy)

S

pmol/L

0.417

pg/mL

Vitamin D (calciferol, 25-hydroxy)

S

nmol/L

0.4006

ng/mL

Vitamin E (tocopherol)

S

nmol/L

0.0431

ng/mL

Xylose (from absorption)

S

mmol/L

15.01

mg/dL

Zinc

S

µmol/L

6.54

µg/dL

  References:

American Society of Clinical Pathology. SI Conversion Guide. adapted from AJCP. 1987; 87:140-151.

Conversion Table for SI Units. Transfusion 1990; 30:79-90.

JAMA Instructions for Authors. 1997; 278: 74-76.

Jordan CD, Flood JG, et al. Normal reference laboratory values. NEJM. 1992; 327: 718-724.

Lehmann HP, Henry JB. Appendix 4: SI Units. pages 1449-1462. IN: Henry JB. Clinical Diagnosis and Management by Laboratory Methods, Nineteenth Edition. W.B. Saunders. 1996.

Lundberg GD. SI Unit Implementation - the next step. JAMA. 1988; 260: 73-74.

McQueen MJ. SI Unit Pocket Guide. ASCP Press. Chicago. 1990.

Tietz NW (editor). Clinical Guide to Laboratory Tests, Third Edition. W.B. Saunders Co. 1995.

Wallach J. Interpretation of Laboratory Tests, 6th edition. Little, Brown and Company. 1996. pages 923-936.

Wallach J. Interpretation of Laboratory Tests, 7th edition. Lippincott Williams & Wilkins. 2000. page 978,

Wilson JD, Foster DW. Williams Textbook of Endocrinology, 8th Edition. W.B. Saunders Co. 1992. (front cover interleaf)

Young DS. Implementation of SI Units for Clinical Laboratory Data. Ann Intern Med. 1987; 106:114-129.

 

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