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 101931-4: Calcium oxalate crystals (U) [Energy diff]

Name: LOINC Code 101931-4: Calcium oxalate crystals (U) [Energy diff]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:17.451Z

101931-4 is a LOINC code used to identify Calcium oxalate crystals (U) [Energy diff] 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 oxalate crystals. 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 oxalate crystals. 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

Calcium oxalate crystals [Energy Difference] in Urine
Calcium oxalate crystals
Ca; CaC2O4; Cal; CaOx; CaOx Cry; Chemistry; Crys; Cryst; Crystal; Ethanedioate; Ethanedioic acid; Oxal; Oxalic acid; Point in time; QNT; Quan; Quant; Quantitative; Random; 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 oxalate crystals (U) [Energy diff]Calcium oxalate crystals [Energy Difference] in UrineCaOx cry EngDiff UrCalcium oxalate crystalsCHEMCalcium oxalate crystals, UrineEngDiff

Frequently asked questions

Code details

Code101931-4

SystemLOINC

Display nameCalcium oxalate crystals (U) [Energy diff]

DescriptionCalcium oxalate crystals

Short nameCaOx cry EngDiff Ur

ComponentCalcium oxalate crystals

PropertyEngDiff

TimingPt

System (specimen)Urine

ScaleQn

ClassCHEM

Example unitskJ/mol

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.75

Last changed2.75

Consumer names

Calcium oxalate crystals, Urine

Part names

Calcium oxalate crystalsEngDiffPtUrineQnEnergy DifferencePoint 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.