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.

LOINCObservation

LOINC Code 40615-7: Calcium oxalate crystals LM.LPF Ql (Urine sed)

Name: LOINC Code 40615-7: Calcium oxalate crystals LM.LPF Ql (Urine sed)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:27.146Z

40615-7 is a LOINC code used to identify Calcium oxalate crystals LM.LPF Ql (Urine sed) 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 sed.

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 sed.

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: DEPRECATED
Order vs observation: Observation
Method: Microscopy.light.LPF

What it does not mean

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

Key facts

Deprecated Calcium oxalate crystals [Presence] in Urine sediment by Microscopy low power field
Calcium oxalate crystals
Arbitrary concentration; Ca; CaC2O4; Cal; CaOx; CaOx Cry; Crys; Cryst; Crystal; Ethanedioate; Ethanedioic acid; LM; Micro; Micros; Microscopic; Ordinal; Oxal; Oxalic acid; Point in time; QL; Qual; Qualitative; Random; Screen; UA; UR; URINALYSIS; Urine sediment; Urn; UrnS

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 LM.LPF Ql (Urine sed)Deprecated Calcium oxalate crystals [Presence] in Urine sediment by Microscopy low power fieldDeprecated CaOx Cry UrnS Ql LPFCalcium oxalate crystalsUACalcium oxalate crystals, Urine sedimentACnc

Frequently asked questions

Code details

Code40615-7

SystemLOINC

Display nameCalcium oxalate crystals LM.LPF Ql (Urine sed)

DescriptionCalcium oxalate crystals

Short nameDeprecated CaOx Cry UrnS Ql LPF

ComponentCalcium oxalate crystals

PropertyACnc

TimingPt

System (specimen)Urine sed

ScaleOrd

MethodMicroscopy.light.LPF

ClassUA

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.15

Last changed2.36

Consumer names

Calcium oxalate crystals, Urine sediment

Part names

Calcium oxalate crystalsACncPtUrine sedOrdMicroscopy.light.LPFArbitrary ConcentrationPoint in time (spot)Urine sedimentMicroscopy low power field

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.