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 33794-9: Calcium 8th specimen post Unsp challenge (U) [Moles/Vol]

Name: LOINC Code 33794-9: Calcium 8th specimen post Unsp challenge (U) [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:21.184Z

33794-9 is a LOINC code used to identify Calcium 8th specimen post Unsp challenge (U) [Moles/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 Calcium^8th 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 Calcium^8th 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

Calcium [Moles/volume] in Urine --8th specimen post XXX challenge
Calcium^8th specimen post XXX challenge
After; Ca; Cal; CHEMISTRY.CHALLENGE TESTING; Level; p chal; Point in time; PST; QNT; Quan; Quant; Quantitative; Random; sp8; sp8 p chal; Spec; Substance concentration; 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

Calcium 8th specimen post Unsp challenge (U) [Moles/Vol]Calcium [Moles/volume] in Urine --8th specimen post XXX challengeCalcium sp8 p chal Ur-sCncCalcium^8th specimen post XXX challengeCHALCalcium 8th specimen after challenge, UrineSCnc

Frequently asked questions

Code details

Code33794-9

SystemLOINC

Display nameCalcium 8th specimen post Unsp challenge (U) [Moles/Vol]

DescriptionCalcium^8th specimen post XXX challenge

Short nameCalcium sp8 p chal Ur-sCnc

ComponentCalcium^8th specimen post XXX challenge

PropertySCnc

TimingPt

System (specimen)Urine

ScaleQn

ClassCHAL

Example unitsmmol/L

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.09

Last changed2.34

Consumer names

Calcium 8th specimen after challenge, Urine

Part names

Calcium^8th specimen post XXX challengeSCncPtUrineQnSubstance 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.