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.
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. |