12 hours Fasting
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
2 days Refrigerated
Centrifuge tubes and separate from cells within 2 hours
0.3 mL
2.6 - 24.9 mu/mL
Patients taking vitamin supplements containing doses of >5 mg/day may have falsely decreased test results generated.
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