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 12790-2: Oxalate 2nd specimen post Unsp challenge (U) [Mass/Vol]

Name: LOINC Code 12790-2: Oxalate 2nd specimen post Unsp challenge (U) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:23.605Z

12790-2 is a LOINC code used to identify Oxalate 2nd specimen post 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 Oxalate^2nd specimen post 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 Oxalate^2nd specimen post 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

Oxalate [Mass/volume] in Urine --2nd specimen post XXX challenge
Oxalate^2nd specimen post XXX challenge
After; CHEMISTRY.CHALLENGE TESTING; Convalescent; Ethanedioate; Ethanedioic acid; Level; Mass concentration; Oxal; Oxalic acid; p chal; Point in time; Post immunization; PST; QNT; Quan; Quant; Quantitative; Random; Second; sp2; sp2 p chal; Spec; UA; 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

Oxalate 2nd specimen post Unsp challenge (U) [Mass/Vol]Oxalate [Mass/volume] in Urine --2nd specimen post XXX challengeOxalate sp2 p chal Ur-mCncOxalate^2nd specimen post XXX challengeCHALOxalate 2nd specimen after challenge, UrineMCnc

Frequently asked questions

Code details

Code12790-2

SystemLOINC

Display nameOxalate 2nd specimen post Unsp challenge (U) [Mass/Vol]

DescriptionOxalate^2nd specimen post XXX challenge

Short nameOxalate sp2 p chal Ur-mCnc

ComponentOxalate^2nd specimen post XXX challenge

PropertyMCnc

TimingPt

System (specimen)Urine

ScaleQn

ClassCHAL

Example unitsmcg/mL;mg/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0j-a

Last changed2.40

Consumer names

Oxalate 2nd specimen after challenge, Urine

Part names

Oxalate^2nd specimen post 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.