>= 17 years old: 8-30 nmol/L
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
- B1, Plasma or Serum
- Thiamine, Plasma or Serum
Collect specimen in a lavender top or red top tube. Centrifuge, aliquot plasma or serum into a plastic vial within 4 hours of collection and freeze. Protect specimen from light.
Protect specimen from light.
Note that whole blood is recommended as the optimum specimen type for Vitamin B1 (thiamine) analysis because the biologically active form of thiamine is found in erythrocytes in the form of thiamin diphosphate (TDP), which is found in very low concentrations in plasma or serum. Test sent to Quest Diagnostics Nichols Institute of Valencia.