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 74909-3: Calcium oxalate dihydrate (Stone) [Mass fraction]

Name: LOINC Code 74909-3: Calcium oxalate dihydrate (Stone) [Mass fraction]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:55.156Z

74909-3 is a LOINC code used to identify Calcium oxalate dihydrate (Stone) [Mass fraction] 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 dihydrate/Total. It is commonly used with the system or sample type Calculus.

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 dihydrate/Total. It is commonly used with the system or sample type Calculus.

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 dihydrate/Total in Stone
Calcium oxalate dihydrate/Total
Ca; CaC2O4; Cal; Calc; Calculi; CaOx; Chemistry; Ethanedioate; Ethanedioic acid; Gastro; Gastroenterology; GI; Kidney; Mass Fraction; Nephrology; Oxal; Oxalic acid; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; Renal; Stn; Stone; Stones; Tot; Totl

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 dihydrate (Stone) [Mass fraction]Calcium oxalate dihydrate/Total in StoneCalcium Oxalate Dihydrate MFr StoneCalcium oxalate dihydrate/TotalCHEMCalcium oxalate dihydrate, StoneMFr

Frequently asked questions

Code details

Code74909-3

SystemLOINC

Display nameCalcium oxalate dihydrate (Stone) [Mass fraction]

DescriptionCalcium oxalate dihydrate/Total

Short nameCalcium Oxalate Dihydrate MFr Stone

ComponentCalcium oxalate dihydrate/Total

PropertyMFr

TimingPt

System (specimen)Calculus

ScaleQn

ClassCHEM

Example units%

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.48

Last changed2.48

Consumer names

Calcium oxalate dihydrate, Stone

Part names

Calcium oxalate dihydrate/TotalMFrPtCalculusQnMass fractionPoint in time (spot)Calculus (stone)

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.