Overview: Testosterone Free Bioavailable Total TestIntroduction: The Testosterone Free Bioavailable Total Test measures testosterone levels to diagnose hormonal disorders, causing infertility. Aligned with 2023 AUA guidelines, it uses biochemical methods for high specificity, supporting hormonal screening. This test is critical for guiding diagnosis, treatment planning, and improving outcomes in endocrinology for patients with suspected hormonal disorders.
Other Names: Testosterone Assay, Free and Total Testosterone Test.
FDA Status: Laboratory-developed test (LDT), meeting endocrinology standards for diagnostic accuracy.
Historical Milestone: Testosterone testing began in the 1970s with hormonal research. Biochemical methods improved in the 2000s, enhancing diagnostic precision.
Purpose: Measures testosterone levels to diagnose hormonal disorders, guides treatment, and evaluates patients with infertility.
Test Parameters: 1. Testosterone Levels
Pretest Condition: Fasting for 10-12 hours required. Collect serum, plasma, or saliva. Report history of infertility or hormonal symptoms.
Specimen: Serum (SST, 2-5 mL), Plasma (EDTA, 2-4 mL), Saliva (sterile container, 1-2 mL). Transport in a biohazard container.
Sample Stability at Room Temperature: 8 hours
Sample Stability at Refrigeration: 7 days
Sample Stability at Frozen: 6 months
Medical History: Document infertility, low libido, or history of hormonal disorders. Include current medications, especially testosterone therapy.
Consent: Written consent required, detailing the tests purpose, hormonal disorder implications, and risks of sample collection.
Procedural Considerations: Uses enzyme-linked immunosorbent assay (ELISA) or chemiluminescence to measure free, bioavailable, and total testosterone. Results are available in 1-2 days, supporting clinical decisions. Performed in laboratories, often for hormonal disorder diagnosis.
Factors Affecting Result Accuracy: Improper fasting or sample hemolysis can affect results. Medications like anabolic steroids may alter testosterone levels.
Clinical Significance: Abnormal testosterone levels confirm hormonal disorders, guiding testosterone therapy or fertility treatments. Normal levels may require SHBG or LH testing.
Specialist Consultation: Consult an endocrinologist or urologist for result interpretation and treatment planning.
Additional Supporting Tests: SHBG, LH/FSH, or semen analysis to confirm hormonal disorder diagnosis.
Test Limitations: Non-specific for certain hormonal conditions; clinical correlation is needed. Sample quality affects sensitivity.
References: AUA Testosterone Guidelines, 2023; Journal of Clinical Endocrinology, Bhasin S, 2022.
