Body levels of B vitamin levels are best determined using enzyme dependent activity tests. Direct measurements of the vitamins are affected by dietary intake and nutritional supplementation.
In our tests for vitamins B1, B2 and B6 we measure the change in enzyme activity (erythrocyte transketolase[ETK], glutathione reductase [EGR] and glutamic-oxalocetic transaminase [EGOT] respectively) before and after the addition of excess vitamin.
B1 (Thiamine) <1.15 normal, 1.15 - 1.25 borderline, >1.25 deficient
B2 (Riboflavin) <1.20 normal, 1.20 - 1.30 borderline, >1.30 deficient
B6 (Pyridoxine) <1.75 normal, 1.75 - 2.00 borderline, >2.00 deficient
Results expressed as ratio of activated to basal activity in IU/gHb
No B vitamin containing supplements for 24 hours prior to testing
rep-bvitamins.pdf (Click to Download)
Green (lithium heparin); sample must reach the Laboratory within 24 hrs
Postal Samples Acceptable:
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