Patient must be fasting a minimum of ten hours for fasting level.
Proton-pump inhibiting medications (omeprazole) should be discontinued 5 days before blood draw
High doses of exogenous biotin (also termed Vitamin B7, Vitamin H or Coenzyme R) may interfere with this assay. It is recommended that patients refrain from consuming any multivitamin or supplement containing biotin for at least 72 hours prior to collection of a blood sample.
Separate serum from cells within 2 hours of collection.