What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 107501-9: Testosterone 4 Hr post Unsp challenge LC/MS/MS [Mass/Vol]

Name: LOINC Code 107501-9: Testosterone 4 Hr post Unsp challenge LC/MS/MS [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:20.215Z

107501-9 is a LOINC code used to identify Testosterone 4 Hr post Unsp challenge LC/MS/MS [Mass/Vol] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Testosterone^4H post XXX challenge. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Testosterone^4H post XXX challenge. It is commonly used with the system or sample type Ser/Plas.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Both
Method: LC/MS/MS

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Testosterone [Mass/volume] in Serum or Plasma by LC/MS/MS --4 hours post XXX challenge
Testosterone^4H post XXX challenge
4h p chal; After; Chemistry; Level; Mass concentration; p chal; Pl; Plasma; Plsm; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Test^4H p XXX chal; Testo; Testos; Testost

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Testosterone 4 Hr post Unsp challenge LC/MS/MS [Mass/Vol]Testosterone [Mass/volume] in Serum or Plasma by LC/MS/MS --4 hours post XXX challengeTestost 4h p chal SerPl LC/MS/MS-mCncTestosterone^4H post XXX challengeCHEMTestosterone 4 hr after challenge, BloodMCnc

Frequently asked questions

Code details

Code107501-9

SystemLOINC

Display nameTestosterone 4 Hr post Unsp challenge LC/MS/MS [Mass/Vol]

DescriptionTestosterone^4H post XXX challenge

Short nameTestost 4h p chal SerPl LC/MS/MS-mCnc

ComponentTestosterone^4H post XXX challenge

PropertyMCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

MethodLC/MS/MS

ClassCHEM

Example unitsug/dL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.81

Last changed2.81

Consumer names

Testosterone 4 hr after challenge, Blood

Part names

Testosterone^4H post XXX challengeMCncPtSer/PlasQnLC/MS/MSMass ConcentrationPoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.