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 49103-5: WBC casts LM.HPF (Urine sed) [#/Area]

Name: LOINC Code 49103-5: WBC casts LM.HPF (Urine sed) [#/Area]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:33.938Z

49103-5 is a LOINC code used to identify WBC casts 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 Leukocyte casts. 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 Leukocyte casts. 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

WBC casts [#/area] in Urine sediment by Microscopy high power field
Leukocyte casts
#/area; Cast; Kidney; Leuc; Leuk; Leukocytes; Lkcs; LM; Micro; Micros; Microscopic; Nephrology; Number areic; Point in time; QNT; Quan; Quant; Quantitative; Random; Renal; UA; UR; URINALYSIS; Urine sediment; Urn; UrnS; WBC; WBC Casts; WBCs; White blood cell; White blood cells

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

WBC casts LM.HPF (Urine sed) [#/Area]WBC casts [#/area] in Urine sediment by Microscopy high power fieldWBC Casts #/area UrnS HPFLeukocyte castsUAWhite blood cell casts, Urine sedimentNaric

Frequently asked questions

Code details

Code49103-5

SystemLOINC

Display nameWBC casts LM.HPF (Urine sed) [#/Area]

DescriptionLeukocyte casts

Short nameWBC Casts #/area UrnS HPF

ComponentLeukocyte casts

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 released2.21

Last changed2.73

Consumer names

White blood cell casts, Urine sediment

Part names

Leukocyte castsNaricPtUrine sedQnMicroscopy.light.HPFWBC castsNumber 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.