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 5801-6: Magnesium ammonium phosphate crystals LM Ql (Urine sed)

Name: LOINC Code 5801-6: Magnesium ammonium phosphate crystals LM Ql (Urine sed)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:38.758Z

5801-6 is a LOINC code used to identify Magnesium ammonium phosphate crystals LM 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 Magnesium ammonium phosphate 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 Magnesium ammonium phosphate 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

What it does not mean

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

Key facts

Deprecated Magnesium ammonium phosphate crystals [Presence] in Urine sediment by Light microscopy
Magnesium ammonium phosphate crystals
Amm; Ammon; Arbitrary concentration; Crys; Cryst; Crystal; i Phos; Inorganic phosphate; LM; MAG; Magnes; Mg; Micro; Micros; Microscopic; NH4; Ordinal; Phos; Phosphate total; Phosphorous; Phosphorus; Phosphrous; Pi; PO4; 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

Magnesium ammonium phosphate crystals LM Ql (Urine sed)Deprecated Magnesium ammonium phosphate crystals [Presence] in Urine sediment by Light microscopyDeprecated MAP Cry UrnS Ql MicroMagnesium ammonium phosphate crystalsUAMagnesium Ammonium Phosphate Crystals, Urine sedimentACnc

Frequently asked questions

Code details

Code5801-6

SystemLOINC

Display nameMagnesium ammonium phosphate crystals LM Ql (Urine sed)

DescriptionMagnesium ammonium phosphate crystals

Short nameDeprecated MAP Cry UrnS Ql Micro

ComponentMagnesium ammonium phosphate crystals

PropertyACnc

TimingPt

System (specimen)Urine sed

ScaleOrd

MethodMicroscopy.light

ClassUA

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0

Last changed2.36

Consumer names

Magnesium Ammonium Phosphate Crystals, Urine sediment

Part names

Magnesium ammonium phosphate crystalsACncPtUrine sedOrdMicroscopy.lightArbitrary ConcentrationPoint in time (spot)Urine sedimentLight microscopy

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.