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.

LOINCActiveObservation

LOINC Code 55378-4: Phosphate crystals amorphous Computer assisted (U) [#/Area]

Name: LOINC Code 55378-4: Phosphate crystals amorphous Computer assisted (U) [#/Area]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:37.144Z

55378-4 is a LOINC code used to identify Phosphate crystals amorphous Computer assisted (U) [#/Area] 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 Phosphate crystals.amorphous. 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 Phosphate crystals.amorphous. 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: Observation
Method: Computer assisted

What it does not mean

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

Key facts

Phosphate crystals amorphous [#/area] in Urine by Computer assisted method
Phosphate crystals.amorphous
#/area; AM; Amorph; Amorph Cry; Amorph Phos Cry; Amorphic; Artificial Intelligence; Automated detection; Comp Assist; Crys; Cryst; Crystal; i Phos; Inorganic phosphate; Number areic; Phos; Phosphate total; Phosphorous; Phosphorus; Phosphrous; Pi; PO4; Point in time; QNT; Quan; Quant; Quantitative; Random; UA; UR; URINALYSIS; 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

Phosphate crystals amorphous Computer assisted (U) [#/Area]Phosphate crystals amorphous [#/area] in Urine by Computer assisted methodAmorph Phos Cry #/area Ur Comp AssistPhosphate crystals.amorphousUAPhosphate crystals amorphous, UrineNaric

Frequently asked questions

Code details

Code55378-4

SystemLOINC

Display namePhosphate crystals amorphous Computer assisted (U) [#/Area]

DescriptionPhosphate crystals.amorphous

Short nameAmorph Phos Cry #/area Ur Comp Assist

ComponentPhosphate crystals.amorphous

PropertyNaric

TimingPt

System (specimen)Urine

ScaleQn

MethodComputer assisted

ClassUA

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.27

Last changed2.69

Consumer names

Phosphate crystals amorphous, Urine

Part names

Phosphate crystals.amorphousNaricPtUrineQnComputer assistedPhosphate crystals amorphousNumber Areic (per area)Point in time (spot)Computer assisted method

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.