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 Release 22.0, Sept. 2008
 
The Medical Algorithms Project
Chapter : ch40. Unit Conversions Section : Unit Conversions
  Conversion of Conventional to SI Units: Analysis of Body Fluids and Feces

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Overview :

Results of chemistry tests performed on body fluids or tissue can be converted between conventional (US) and SI units if the conversion factors are known.

 

Specimens (as specified): amniotic fluid, cerebrospinal fluid (CSF), gastric fluid, feces, sweat, synovial fluid, tissue

 

Test

Specimen

Conventional Units

Factor for Conversion

SIU Units

Acid output

gastric fluid

mEq/h

1

mmol/h

Albumin

CSF

mg/dL

10

mg/L

Albumin

amniotic fluid

mg/dL

10

mg/L

Bilirubin

amniotic fluid

mg/dL

17.1

µmol/L

Chloride

sweat

mEq/L

1

mmol/L

Coproporphyrins

feces

µg/g feces

1.5

nmol/g feces

Creatinine

amniotic fluid

mg/dL

88.4

µmol/L

DHEA-S (dehydro-epiandrosterone sulfate)

amniotic fluid

ng/mL

2.6

nmol/L

Estriol

amniotic fluid

µg/dL

3.468

nmol/L

Glucose

CSF

mg/dL

0.05551

mmol/L

Hormone receptor, progesterone

tissue

fmol/mg protein

1

nmol/kg protein

Hormone receptor, estrogen

tissue

fmol/mg protein

1

nmol/kg protein

Nitrogen, total

feces

g/24 h

71.39

mmol/d

Protein, total

CSF

mg/dL

10

mg/L

Protein, total

amniotic fluid

g/dL

10

g/L

RBC

CSF

/µL

1

10^6 /L

Sodium

sweat

mEq/L

1

mmol/L

Sperm count

semen

10^6/mL

1000

10^9/L

Urea

amniotic fluid

mg/dL

0.1665

mmol/L

Urobilinogen

feces

mg/24 h

1.693

µmol/d

WBC

CSF

/µL

1

10^6 /L

WBC

synovial fluid

/µL

1

10^6/L

 

  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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