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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 acida

ng/mL

2.265518804

nmol/L

441.4

5-Methyltetrahydrofolateb

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.



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