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
48 hours Refrigerated
24 hours unspun
0.5 mL
0.0-6.5 ng/mL
Patients taking vitamin supplements containing doses of >5 mg/day may have falsely decreased test results generated.
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