Patient should discontinue taking Biotin, Vitamin B7, or Vitamin H 48 hours before getting blood drawn.
1.0 mL Serum in a SST Gold Top Tube
1.0 mL Serum from a Red Top Tube in a Plastic Vial
5 days Refrigerated
3 months Frozen
24 hours unspun
Avoid Thaw/Freeze Cycles
0.25 mL
8:00 AM: 6.0 - 23.0 ug/dl
4:00 PM: 2.4 - 12.8 ug/dl
Patients taking vitamin supplements containing high doses of biotin (>5 mg/day) may have falsely increased test results generated.
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