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Test ID: TTBS    
Testosterone, Total and Bioavailable, Serum

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Secondary ID A test code used for billing and in test definitions created prior to November 2011


NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.


Useful For Suggests clinical disorders or settings where the test may be helpful

Testosterone, Total:

-Evaluation of men with symptoms or signs of possible hypogonadism, such as loss of libido, erectile dysfunction, gynecomastia, osteoporosis, infertility

-Evaluation of boys with delayed or precocious puberty

-Monitoring testosterone replacement therapy

-Monitoring antiandrogen therapy (eg, used in prostate cancer, precocious puberty, treatment of idiopathic hirsutism, male-to-female transgender disorders)

-Evaluation of women with hirsutism, virilization, and oligo-amenorrhea

-Evaluation of women with symptoms or signs of possible testosterone deficiency

-Evaluation of infants with ambiguous genitalia or virilization

-Diagnosis of androgen-secreting tumors


Testosterone, Total and Bioavailable

-This is the recommended second-level test for suspected increases or decreases in physiologically active testosterone

-Assessment of androgen status in cases with suspected or known sex hormone-binding globulin binding abnormalities

-Assessment of functional circulating testosterone in early pubertal boys and older men

-Assessment of functional circulating testosterone in women with symptoms or signs of hyperandrogenism but normal total testosterone levels

-Monitoring of testosterone therapy or antiandrogen therapy in older men and in females

Profile Information A profile is a group of laboratory tests that are ordered and performed together under a single Mayo Test ID. Profile information lists the test performed, inclusive of the test fee, when a profile is ordered and includes reporting names and individual availability.

Test IDReporting NameAvailable SeparatelyAlways Performed
BATSTestosterone, Bioavailable, SNoYes
TTSTTestosterone, Total, SYesYes

Method Name A short description of the method used to perform the test

TTST: Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

BATS: Differential Precipitation

Reporting Name A shorter/abbreviated version of the Published Name for a test; an abbreviated test name

Testosterone, Total and Bioavail, S

Aliases Lists additional common names for a test, as an aid in searching

Bioavailable Testosterone
NonSex Hormone Binding Globulin (SHBG)