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 we measure the change in enzyme activity (erythrocyte transketolase[ETK]) before and after the addition of excess vitamin. Reference ranges: B1 (Thiamine) <1.15 normal, 1.15 - 1.25 borderline, >1.25 deficient Results expressed as ratio of activated to basal activity in IU/gHb
Included in Profiles:
B vitamin profile and full Vitamin Profile
Green (lithium heparin)- must reach the lab within 24 hours of collection.