ch40.01.03 : Conversion of Conventional to SI Units: Urine Chemistries

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Chapter :

ch40. Unit Conversions

Section :

Unit Conversions

Conversion of Conventional to SI Units: Urine Chemistries

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Overview :

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

Specimen: urine

Test	Conventional Units	Factor for Conversion	SIU Units
17-Hydroxycorticosteroids (17-OHCS)	mg/g of creatinine	113.1	mg/mol of creatinine
17-Hydroxyketosteroids (17-OHKS, cortisol)	mg/24 h	2.76	µmol/d
17-Hydroxyketosteroids (17-OHKS, cortisol)	µg/24 h	2.76	nmol/d
17-Ketosteroids (as DHEA)	mg/24 h	3.47	µmol/d
5-Hydroxyindoleacetic acid (5-HIAA)	mg/24 h	5.2	µmol/d
Albumin	mg/24 h	0.001	g/d
Aldosterone	mEq/24 h	1	mmol/d
Aldosterone	µg/24 h	2.77	nmol/d
Amylase	Somogyi units/h	0.185	U/h
Ascorbic acid	mg/dL	5.678	µmol/L
Calcium	mg/24 h	0.025	mmol/d
Catecholamines, fractionated - dopamine	µg/24 h	6.53	nmol/d
Catecholamines, fractionated - dopamine	µg/mg creatinine	738	µmol/mol creatinine
Catecholamines, fractionated - dopamine	pg/mL	6.53	pmol/L
Catecholamines, fractionated - dopamine	ng/mL	6.53	nmol/L
Catecholamines, fractionated - epinephrine	µg/24 h	5.46	nmol/d
Catecholamines, fractionated - epinephrine	µg/mg creatinine	617	µmol/mol creatinine
Catecholamines, fractionated - epinephrine	pg/mL	5.46	pmol/L
Catecholamines, fractionated - epinephrine	ng/mL	5.46	µmol/d
Catecholamines, fractionated - norepinephrine	µg/24 h	5.91	nmol/d
Catecholamines, fractionated - norepinephrine	µg / mg creatinine	669	µmol/mol creatinine
Catecholamines, fractionated - norepinephrine	pg/mL	5.91	pmol/L
Catecholamines, fractionated - norepinephrine	ng/mL	5.91	nmol/L
Chloride	mEq/24 h	1	mmol/d
Copper	µg/24 h	0.0157	µmol/d
Coproporphyrin	µg/dL	15.27	nmol/L
Coproporphyrins	µg/24 h	1.527	nmol/d
Creatinine	g/24 h	8.84	mmol/d
Creatinine	mg/24 h	0.0088	mmol/d
Creatinine	mg/kg/24 h	8.84	µmol/kg•d
Cyclic adenosine monophosphate (c-AMP)	mg/24 h	3.04	µmol/d
Cyclic adenosine monophosphate (c-AMP)	mg/g creatinine	344	µmol/mol creatinine
Estrogens, total	µg/24 h	3.47	nmol/d
Glucose	mg/d	0.0056	mmol/d
Homovanillic Acid (HVA)	mg/24 h	5.49	µmol/d
Homovanillic Acid (HVA)	µg/24 h	0.0055	µmol/d
Homovanillic Acid (HVA)	µg/mg of creatinine	0.621	mmol/mol of creatinine
Lead	µg/24 h	0.0048	µmol/d
Magnesium	mg/24 h	0.411	mmol/d
Magnesium	mEq/24 h	0.5	mmol/d
Metanephrines, fractionated - metanephrine	mg/24 h	5.07	µmol/d
Metanephrines, fractionated - metanephrine	mg/g creatinine	0.5736	µmol/mol creatinine
Metanephrines, fractionated - normetanephrine	ng/mL	5.46	nmol/L
Metanephrines, fractionated - normetanephrine	mg/ g creatinine	0.617	mmol/ mol creatinine
Muramidase (lysozyme)	mg/24 h	1	mg/d
Myoglobin	mg/L	1	mg/L
Phosphate (inorganic phosphorus)	g/24 h	32.29	mmol/d
Porphobilinogen	mg/24 h	4.42	µmol/d
Potassium	mEq/24 h	1	mmol/d
Potassium	mg/24 h	0.0256	mmol/d
Pregnanediol	mg/d	3.12	µmol/d
Protein, total	mg/24 h	0.001	g/d
Reducing substances, total	mg/d	1	mg/d
Sodium	mEq/24 h	1	mmol/d
Sodium	mg/24 h	0.0435	mmol/d
Urea nitrogen	g/24 h	0.0357	mol/d urea
Uric acid	mg/24 h	0.0059	mmol/d
Uroporphyrin	µg/24 h	1.204	nmol/d
Uroporphyrin	µg/gm creatinine	1.1362	nmol/ mmol creatinine
Vanillylmandelic acid (VMA)	mg/24 h	5.046	µmol/d
Vanillylmandelic acid (VMA)	µg / mg creatinine	0.571	mmol / mol of creatinine
Xylose	mg/dL	0.0666	mmol/L
Xylose	g/5 h	6.66	mmol/5 h
Zinc	mg/d	15.3	µmol/d
∂-Aminolevulinic acid	mg/24 h	7.63	µmol/d

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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