Testosterone, Free, Direct With Total Testosterone, LC/MS-MS

CPT: 84402; 84403
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Test Details

Use

Evaluate hirsutism and masculinization in women; evaluate testicular function in clinical states in which testosterone-binding proteins may be altered (obesity, cirrhosis, thyroid disorders)

Methodology

Free: Direct analog enzyme immunoassay (EIA); Total: liquid chromatography/tandem mass spectrometry (LC/MS-MS)

Specimen Requirements

Specimen

Serum

Volume

2 mL

Minimum Volume

1.3 mL (Note: This volume does not allow for repeat testing.)

Container

Red-top tube or gel-barrier tube

Collection

If a red-top tube is used, transfer separated serum to a plastic transport tube.

Storage Instructions

Refrigerate

Stability Requirements

Temperature

Period

Room temperature

6 days

Refrigerated

7 days

Frozen

14 days

Freeze/thaw cycles

Stable x3

Clinical Information

Special Instructions

State patient's age and sex on the test request form.

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
070195 Testosterone, Free+Total LC/MS 070036 Testosterone, Total, LC/MS ng/dL 2986-8
070195 Testosterone, Free+Total LC/MS 144981 Free Testosterone(Direct) pg/mL 2991-8

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The LOINC® codes are copyright © 1994-2018, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf