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 58449-0: RBC clumps LM.HPF (Urine sed) [#/Area]

Name: LOINC Code 58449-0: RBC clumps LM.HPF (Urine sed) [#/Area]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:39.275Z

58449-0 is a LOINC code used to identify RBC clumps LM.HPF (Urine sed) [#/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 Erythrocyte clumps. 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 Erythrocyte clumps. 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: ACTIVE
Order vs observation: Observation
Method: Microscopy.light.HPF

What it does not mean

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

Key facts

Erythrocyte clumps [#/area] in Urine sediment by Microscopy high power field
Erythrocyte clumps
#/area; Discocyte; Erc; Erythrocytes; Kidney; LM; Micro; Micros; Microscopic; Nephrology; Number areic; Point in time; QNT; Quan; Quant; Quantitative; Random; RBC; RBC clumps; Red blood cell; Red blood cells; Red blood corpuscle; Red blood corpusles; Red cell; Red cells; Renal; 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

RBC clumps LM.HPF (Urine sed) [#/Area]Erythrocyte clumps [#/area] in Urine sediment by Microscopy high power fieldRBC clumps #/area UrnS HPFErythrocyte clumpsUARed blood cell clumps, Urine sedimentNaric

Frequently asked questions

Code details

Code58449-0

SystemLOINC

Display nameRBC clumps LM.HPF (Urine sed) [#/Area]

DescriptionErythrocyte clumps

Short nameRBC clumps #/area UrnS HPF

ComponentErythrocyte clumps

PropertyNaric

TimingPt

System (specimen)Urine sed

ScaleQn

MethodMicroscopy.light.HPF

ClassUA

Example units/HPF

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.30

Last changed2.73

Consumer names

Red blood cell clumps, Urine sediment

Part names

Erythrocyte clumpsNaricPtUrine sedQnMicroscopy.light.HPFNumber Areic (per area)Point in time (spot)Urine sedimentMicroscopy high 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.