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

  Conversion of SI to Conventional Units: Hematology and Coagulation

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Copyright (c) 2006-2007, Institute for Algorithmic Medicine, Houston, TX, USA. All rights reserved.
     

Overview :

Results of hematology or coagulation tests can be converted between conventional (US) and SI units if the conversion factors are known.

Specimen: whole blood or plasma

Hematology Test

Specimen

SIU Units

Factor for Conversion

Conventional Units

Fetal Hemoglobin

blood, whole

mol/mol

100

%

Hematocrit

blood, whole

volume fraction

100

%

Hemoglobin

blood, whole

g/L

0.1

g/dL

Hemoglobin

blood, whole

mmol/L

6.45

g/dL

Hemoglobin

plasma

µmol/L

6.45

mg/dL

MCH

blood, whole

pg/cell

1

pg/cell

MCH

blood, whole

fmol/cell

16.11

pg/cell

MCHC

blood, whole

g/L

0.1

g/dL

MCV

blood, whole

fL

1

cubic microns

Platelet Count

blood, whole

10^9/L

1

10^3/µL

RBC

blood, whole

10^12/L

1

10^6/µL

Reticulocytes

blood, whole

10^9/L

1000

reticulocytes /µL

WBC

blood, whole

10^9/L

1

10^3/µL

Coagulation Test

Specimen

SIU Units

Factor for Conversion

Conventional Units

Antithrombin III

plasma

mg/L

0.1

mg/dL

Antithrombin III

plasma

U/L

0.1

U/dL

Coagulation Factors

plasma

U/L

0.001

U/mL

Fibrin Degradation Products

plasma

mg/L

1

µg/ml

Fibrinogen

plasma

g/L

100

mg/dL

Plasminogen

plasma

mg/L

0.1

mg/dL

Plasminogen

plasma

U/L

0.1

U/dL

Protein C

plasma

mg/L

0.1

mg/dL

Protein C

plasma

U/L

0.1

U/dL

Protein S

plasma

mg/L

0.1

mg/dL

Protein S

plasma

U/L

0.1

U/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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