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TSTO
TESTOSTERONE, TOTAL, SERUM

Test Code TSTO 
Test TESTOSTERONE, TOTAL, SERUM 
Methodology Electrochemiluminescence Immunoassay (ECLIA) 
Description Useful in assessing testicular function in males and managing disorders of androgen overproduction in females. Also appropriate in evaluating men with gynecomastia, in boys with delayed pubertal development and in girls with masculinizing precocious puberty.

No sample should be collected on patients receiving therapy with high biotin doses (i.e. biotin therapy for Multiple Sclerosis or oncology patients; skin, hair and nail supplements, or multivitamins containing > 5 mg/day) until at least 12 hours after the last biotin administration. If unsure, or if the clinical picture does not fit the results please contact the laboratory . We have methods to check for biotin interference as well as for any other interferences and for the accuracy of the results.

Biotin interference would falsely increase the result of this assay. 

Specimen Draw blood in either a plain, red top tube, or serum gel tube. Spin down and send 1.0 mL (minimum volume: 0.5 mL) of serum, refrigerated. 
Reference Values Males
Age (Years)……………. Normal Reference Range

0-10 ……Not indicated, please order TESES instead
11-15 …………………….2.0-830.0 ng/dL
16-20 …………………….103.0-1011.0 ng/dL
21-50……………………. 249.0-836.0 ng/dL
51 and up …………………193.0-740.0 ng/dL

Females
Age (Years)…………… Normal Reference Range

0-10 …….Not indicated, please order TESES instead
11-20………………………. 2.0-78.0 ng/dL
21-50……………………… .8.4-48.1 ng/dL
51 and up……………………2.9-40.8 ng/dL 

Analytic Time 1 Day 
Day(s) Test Set Up Monday through Sunday 
CPT Code(s) 84403  Testosterone, Total, Serum