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Test Code TES Testosterone, Total Only, Serum

Important Note

   Many dietary supplements promoted for hair, skin, and nail benefits contain Biotin (Vitamin B7) levels up to 650 times the recommended daily intake.  High levels of Biotin can cause clinically significant incorrect lab test results, resulting in falsely high or falsely low results, depending on the test. Patients taking high doses of Biotin should be instructed to discontinue Biotin for at least 12 hours prior to lab testing.

Performing Laboratory

MaineGeneral Medical Center

Reference Values

Males:  241-827 ng/dL

Females:  14-76 ng/dL

Methodology

Immunochemiluminometric Assay (ICMA)

Useful in evaluation of hirsutism and masculinization in women; evaluation of testicular function in clinical states where the testosterone binding proteins may be altered.

Specimen Requirements

Draw blood in a plain, red-top tube(s) or a serum gel tube(s). Spin down and send 2 mL of serum refrigerated.

Note:  Label specimen with patient’s name (first and last), date of birth, date and time of draw, and phlebotomist’s initials.

Day(s) Test Set Up

Tuesday and Friday

Test Classification and CPT Coding

84403