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Suggested Citation: "C Système International d'Unités." Institute of Medicine. 1998. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. Washington, DC: The National Academies Press. doi: 10.17226/6015.

C
Système International d’Unités

In the text of this report, the Système International d’Unités (SI units) are presented for hematological and clinical chemistry values, with traditional units in parentheses. The conversion factors for hematological and clinical chemistry values are given in Table C-1.

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TABLE C-1 Factors Used to Convert Between Traditional Units and the Système International d’Unités (SI Units)

Nutrient	Traditional Unit	Conversion Factor	SI Unit	Molecular Weight
Thiamin	µg/24h	0.003324468	µmol/d	300.8
Thiamin hydrochloride	µg/24h	0.00296472	µmol/d	337.3
Riboflavin	µg/dL	26.5674814	nmol/L	376.4
Flavin mononucleotide (FMN)	ng/mL	2.191540653	nmol/L	456.3
Flavin-adenine dinucleotide (FAD)	ng/mL	1.205545509	nmol/L	829.5
Niacin	mg/d	8.123476848	µmol/d	123.1
Niacinamide	mg/d	8.19000819	µmol/d	122.1
Pyridoxine hydrochloride	mg	4.86381323	µmol	205.6
Vitamin B₆	ng/mL	5.910165485	nmol/L	169.2
Pyridoxal	ng/mL	5.980861244	nmol/L	167.2
Pyridoxamine	ng/mL	5.94530321	nmol/L	168.2
Pyridoxal 5′-phosphate	ng/mL	4.046944557	nmol/L	247.1
Folic acid^a	ng/mL	2.265518804	nmol/L	441.4
5-Methyltetrahydrofolate^b	ng/mL	2.176752286	nmol/L	459.4
Vitamin B₁₂ (cyano)	pg/mL	0.737789582	pmol/L	1,355.4
Coenzyme B₁₂	pg/mL	0.633071664	pmol/L	1,579.6
Methylcobalamin	pg/mL	0.743826242	pmol/L	1,344.4
Pantothenic acid	µg/mL	4.562043796	µmol/L	219.2
Coenzyme A	µg/mL	1.302931596	µmol/L	767.5
Biotin	ng/mL	4.093327876	nmol/L	244.3
Choline base	mg/mL	8.250825083	mmol/L	121.2
Choline chloride	mg/mL	7.163323782	mmol/L	139.6
NOTE: Conversion factors convert traditional values to SI units. To convert to SI units, multiply the traditional unit by the conversion factor. To convert to traditional units, divide the SI unit by the conversion factor. ^a Pteroylglutamic acid. ^b Most predominant form in serum, plasma, and erythrocytes.

Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline (1998)

Chapter: C Système International d'Unités

C
Système International d’Unités

My Academies

Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline (1998)

Chapter: C Système International d'Unités

C Système International d’Unités

C
Système International d’Unités