HoSt/VDSCP Certified Participants

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Testosterone in Serum

The following laboratories have successfully passed the performance criterion ±6.4% mean bias to the CDC Testosterone Reference Method over the concentration range of 2.50-1,000 ng/dL. Laboratories are awarded certificates for successfully completing bias testing using specific methods, reagent lots, calibrator lots and instrumentation. During the year it is the responsibility of the participant to ensure that the results of their method remain consistent over time, throughout the year, between lots, and over the measurement range reported. It is not the intent of the CDC HoSt Program to certify each lot of reagents, or to issue certification beyond the measurement range of 2.50-1,000 ng/dL, at this time.

HoSt Total Testosterone Certified Assays [PDF – 282 KB]
Certifications from 2020 (Updated November 2023)

HoSt Testosterone Certified Procedures [PDF – 251 KB]
Certifications prior to 2020

Total 25-hydroxyvitamin D in Serum

The following laboratories have successfully passed the performance criterion of ±5% mean bias to the CDC and University of Ghent Vitamin D2 and D3 Reference Method and an overall imprecision of <10% over the concentration range of 22-275 nmol/L for total 25-hydroxyvitamin D. Laboratories are awarded certificates for successfully completing bias and imprecision testing using specific methods, reagent lots, calibrator lots and instrumentation. During the year it is the responsibility of the participant to ensure that the results of their method remain consistent over time, throughout the year, between lots, and over the measurement range reported. It is not the intent of the CDC VDSCP to certify each lot of reagents, or to issue certification beyond the measurement range of 22.5-275 nmol/L, at this time.

VDSCP Vitamin D Certified Assays [PDF – 320 KB]
Certifications from 2020 (Updated November 2023)

VDSCP Vitamin D Certified Procedures [PDF – 518 KB]
Certifications prior to 2020

Estradiol in Serum

The following laboratories have successfully passed the performance criteria of ±12.5% mean bias (for samples >20 pg/mL) and ±2.5 pg/mL absolute bias (for samples ≤20 pg/mL) to the CDC Estradiol Reference Method in serum over the concentration range of 1.92-209 pg/mL. Laboratories are awarded certificates for successfully completing bias testing using specific methods, reagent lots, calibrator lots and instrumentation. During the year it is the responsibility of the participant to ensure that the results of their method remain consistent over time, throughout the year, between lots, and over the measurement range reported. It is not the intent of the CDC HoSt Program to certify each lot of reagents, or to issue certification beyond the measurement range of 1.92-209 pg/mL, at this time.

HoSt Estradiol Certified Assays [PDF – 232 KB]
Certifications from 2020 (Updated November 2023)

HoSt Estradiol Certified Procedures [PDF – 288 KB]
Certifications prior to 2020