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

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Overview :

Results of chemistry tests performed on body fluid 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

SIU Units

Factor for Conversion

Conventional Units

Acid output

gastric fluid

mmol/h

1

mEq/h

Albumin

CSF

mg/L

0.1

mg/dL

Albumin

amniotic fluid

mg/L

0.1

mg/dL

Bilirubin

amniotic fluid

µmol/L

0.0585

mg/dL

Chloride

sweat

mmol/L

1

mEq/L

Coproporphyrins

feces

nmol/g feces

0.67

µg/g feces

Creatinine

amniotic fluid

µmol/L

0.0113

mg/dL

DHEA-S (dehydro-epiandrosterone sulfate)

amniotic fluid

nmol/L

0.38

ng/mL

Estriol

amniotic fluid

nmol/L

0.2884

µg/dL

Glucose

CSF

mmol/L

18.01

mg/dL

Hormone receptor, progesterone

tissue

nmol/kg protein

1

fmol/mg protein

Hormone receptor, estrogen

tissue

nmol/kg protein

1

fmol/mg protein

Nitrogen, total

feces

mmol/d

0.0140

g/24 h

Protein, total

CSF

mg/L

0.1

mg/dL

Protein, total

amniotic fluid

g/L

0.1

g/dL

RBC

CSF

10^6/L

1

/µL

Sodium

sweat

mmol/L

1

mEq/L

Sperm count

semen

10^9/L

0.001

10^6/mL

Urea

amniotic fluid

mmol/L

6.01

mg/dL

Urobilinogen

feces

µmol/d

0.5907

mg/24 h

WBC

CSF

10^6/L

1

/µL

WBC

synovial fluid

10^6/L

1

/µL

 

  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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