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LOINC Code 13945-1: RBC LM.HPF (Urine sed) [#/Area]

13945-1 is a LOINC code used to identify RBC 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 Erythrocytes. It is commonly used with the system or sample type Urine sed.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Erythrocytes. 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

  • Erythrocytes [#/area] in Urine sediment by Microscopy high power field
  • Erythrocytes
  • #/area; Discocytes; Erthrocyte; Erythrocyte; Kidney; LM; Micro; Micros; Microscopic; Nephrology; Number areic; Point in time; QNT; Quan; Quant; Quantitative; Random; RBC; RBCS; 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 LM.HPF (Urine sed) [#/Area]Erythrocytes [#/area] in Urine sediment by Microscopy high power fieldRBC #/area UrnS HPFErythrocytesUARed Blood Cell (RBC) Count, Urine sedimentNaric

Frequently asked questions

Code details

Code13945-1
SystemLOINC
Display nameRBC LM.HPF (Urine sed) [#/Area]
DescriptionErythrocytes
Short nameRBC #/area UrnS HPF
ComponentErythrocytes
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 released1.0k
Last changed2.73

Consumer names

Red Blood Cell (RBC) Count, Urine sediment

Part names

ErythrocytesNaricPtUrine 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.