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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Testosterone, Total, Males (Adult), Immunoassay
Test Code873
CPT Codes
84403
Preferred Specimen
1 mL serum
Patient Preparation
Due to changes in testosterone levels throughout the day, two morning (8:00-10:00 a.m.) specimens obtained on different days are recommended by The Endocrine Society for screening.
Minimum Volume
0.5 mL
Instructions
Dietary supplements containing biotin may interfere in assays and may skew results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.
Note: This assay should be performed on adult (≥18 years) males.
Note: This assay should be performed on adult (≥18 years) males.
Transport Container
Serum separator tube (SST)
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 5 days
Refrigerated: 7 days
Frozen: 21 days
Refrigerated: 7 days
Frozen: 21 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Grossly icteric
Methodology
Immunoassay (IA)
Setup Schedule
Tues-sat
Report Available
1-4 days
Limitations
Immunoassay does not provide sufficient sensitivity in detecting low concentrations among non-adults and women.
Reference Range
Adult Male | 250-827 ng/dL |
All test requests for Testosterone on female and pediatric (<18 years) patients must use test code 15983 - Testosterone, Total, LC/MS/MS.
Clinical Significance
Testosterone circulates almost entirely bound to transport proteins: Normally less than 1-2% is free. The principal transport protein for testosterone is known as sex hormone binding globulin (SHBG) or testosterone-estradiol binding globulin (TeBG). Testosterone measurements are used to assess erectile dysfunction, infertility, gynecomastia, and osteoporosis and to assess hormone replacement therapy.
Performing Laboratory
Quest Diagnostics-Lenexa |
10101 Renner Blvd |
Lenexa , KS 66219-9752 |