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.

LOINCActiveObservation

LOINC Code 39981-6: Creatinine 30 Min pre Unsp challenge (U) [Mass/Vol]

Name: LOINC Code 39981-6: Creatinine 30 Min pre Unsp challenge (U) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:26.654Z

39981-6 is a LOINC code used to identify Creatinine 30 Min pre Unsp challenge (U) [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 Creatinine^30M pre XXX challenge. It is commonly used with the system or sample type Urine.

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 Creatinine^30M pre XXX challenge. It is commonly used with the system or sample type Urine.

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: Observation

What it does not mean

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

Key facts

Creatinine [Mass/volume] in Urine --30 minutes pre XXX challenge
Creatinine^30M pre XXX challenge
30M pre chal; Before; CHEMISTRY.CHALLENGE TESTING; CR; Crea; Creat; Level; Mass concentration; Point in time; pre chal; QNT; Quan; Quant; Quantitative; Random; UA; UCr; UR; Urn

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

Creatinine 30 Min pre Unsp challenge (U) [Mass/Vol]Creatinine [Mass/volume] in Urine --30 minutes pre XXX challengeCreat 30M pre chal Ur-mCncCreatinine^30M pre XXX challengeCHALCreatinine 30 min before challenge, UrineMCnc

Frequently asked questions

Code details

Code39981-6

SystemLOINC

Display nameCreatinine 30 Min pre Unsp challenge (U) [Mass/Vol]

DescriptionCreatinine^30M pre XXX challenge

Short nameCreat 30M pre chal Ur-mCnc

ComponentCreatinine^30M pre XXX challenge

PropertyMCnc

TimingPt

System (specimen)Urine

ScaleQn

ClassCHAL

Example unitsg/L; mcg/mL; mg/dL; mg/mL

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.15

Last changed2.70

Consumer names

Creatinine 30 min before challenge, Urine

Part names

Creatinine^30M pre XXX challengeMCncPtUrineQnMass ConcentrationPoint in time (spot)

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.