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

CPT: 84402; 84403
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Special Instructions

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


Expected Turnaround Time

4 - 6 days



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

Serum should be transferred from cells within one hour of collection and transferred to a plastic transport tube.


Storage Instructions

Refrigerate


Stability Requirements

Temperature

Period

Room temperature

7 days

Refrigerated

7 days

Frozen

14 days

Freeze/thaw cycles

Stable x3


Causes for Rejection

Plasma specimen; gross lipemia (may yield erroneously high testosterone results); improper labeling


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)


Limitations

This test was developed and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.


Methodology

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


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

For Providers

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The LOINC® codes are copyright © 1994-2019, 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