--- Query Results --- | |||||
| Organization: | Alberta Precision Laboratories | ||||
| Test Name/Synonym: | Testosterone, Bioavailable - Calgary Zone (CLS) | ||||
| Collection Alert: | If Measured Bioavailable Testosterone is requested, refer to Testosterone, Measured Bioavailable. | ||||
| Test Code: | BIOTESTO | ||||
| Primary Container: | SST (Gold) AND lithium heparin PST Gel (Light Green) | ||||
| Tube/Container Type: | |||||
| Specimen Collection Requirements: | This is a user pay test not covered by Alberta Health & Wellness. The patient must pay at time of collection. One 3.5 mL gold top SST tube AND One 3.0 mL light green (mint) top PST tube 1 mL serum AND 0.5 mL plasma | ||||
| Testing Schedule: | Test performed Monday to Friday | ||||
| Reference Interval: |
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| Testing Area: | Immunochemistry | ||||
| Performing Site: | Diagnostic and Scientific Centre | ||||
| Additional Test Information: | The concentration of Bioavailable Testosterone is derived from a mathematical expression based on constants for the binding of Testosterone to Sex Hormone Binding Globulin and Albumin. Indicate gender of patient on the requisition. Testosterone exhibits diurnal variation in adult males. Values are highest in the morning, with decreases up to 25% later in the day. Reference intervals were established on specimens collected in the morning (07:00 - 10:00), thus it is suggested to collect specimens within this timeframe. The amplitude of diurnal variation decreases with age, with patients aged >70 showing an approximate 10% decrease. Diurnal variation of testosterone in females is not well defined in the literature, but similar variation may be expected in pre-menopausal women. Reference: Brambilla, DJ, Matsumoto, AM, Araujo, AB, McKinlay, JB. The Effect of Diurnal Variation on Clinical Measurement of Serum Testosterone and Other Sex Hormone Levels in Men. J. Clin. Endocrinol. Metab. 2009. 94(3):907-913. | ||||
