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LOINC Code 79129-3: Uroporphyrin 3 isomer/Creatinine (U) [Mass ratio]

79129-3 is a LOINC code used to identify Uroporphyrin 3 isomer/Creatinine (U) [Mass ratio] 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 Uroporphyrin 3 isomer/Creatinine. It is commonly used with the system or sample type Urine.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Uroporphyrin 3 isomer/Creatinine. 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: Both

What it does not mean

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

Key facts

  • Uroporphyrin 3 isomer/Creatinine [Mass Ratio] in Urine
  • Uroporphyrin 3 isomer/Creatinine
  • This test measures the ratio of uropophyrin 3 isomer to creatinine in the urine to determine whether porphyrin build up in occurring in the body.
  • Chemistry; CR; Crea; Creat; III; Isom; Mass concentration ratio; Mass ratio; MCRto; Octacarboxyl porphyrin; Octacarboxylporphyrin; Octacarboxyphyrin; Point in time; Porphyria; Porphyria cutanea tarda; QNT; Quan; Quant; Quantitative; Random; UA; UCr; UR; Urn; Urophorph; Uropor3; Uroporphyrin III

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

Uroporphyrin 3 isomer/Creatinine (U) [Mass ratio]Uroporphyrin 3 isomer/Creatinine [Mass Ratio] in UrineUropor3/Creat UrUroporphyrin 3 isomer/CreatinineCHEMUroporphyrin 3 isomer/Creatinine, UrineMRto

Frequently asked questions

Code details

Code79129-3
SystemLOINC
Display nameUroporphyrin 3 isomer/Creatinine (U) [Mass ratio]
DescriptionUroporphyrin 3 isomer/Creatinine
Short nameUropor3/Creat Ur
ComponentUroporphyrin 3 isomer/Creatinine
PropertyMRto
TimingPt
System (specimen)Urine
ScaleQn
ClassCHEM
Example unitsug/g creatinine
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.54
Last changed2.73

Consumer names

Uroporphyrin 3 isomer/Creatinine, Urine

Part names

Uroporphyrin 3 isomer/CreatinineMRtoPtUrineQnMass RatioPoint 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.