Fasting patients preferred
2.0 mL Serum from a Red Top Tube in a Plastic Vial
7 days Ambient
7 days Refrigerated
28 days Frozen
0.2 mL Serum
Pregnancy Reference Ranges
First Trimester: 0.9 - 2.0 ng/dL
Second Trimester: 0.8 - 1.5 ng/dL
Third Trimester: 0.8 - 1.7 ng/dL
Prematures, 25-30 weeks Birth to 7 days: 0.5 - 3.3 ng/dL
Prematures, 31-36 weeks, Birth to 7 days: 1.3 - 4.7 ng/dL
Cord Blood, > 37 weeks: 1.2-2.2 ng/dL
Birth to 4 days: 2.2 - 5.3 ng/dL
5 days to 13 days: Reference Range not established
2 weeks to 2 years: 0.8 - 2.0 ng/dL
3 years to 20 years: 1.0-2.4 ng/dL
21 years to 87 years: 0.8 - 2.7 ng/dL
> 87 years: Reference Range not established
This assay utilizes biotin technology. Patients taking vitamin supplements containing high doses of biotin (>5 mg/day) may have falsely increased test results generated.
4 to 7 days
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