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LOINC Code 75237-8: RBC LM.HPF (Syn fld) [#/Area]

75237-8 is a LOINC code used to identify RBC LM.HPF (Syn fld) [#/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 Synv fld.

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 Synv fld.

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: Both
  • 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 Synovial fluid by Microscopy high power field
  • Erythrocytes
  • Presence of a large number of red blood cells in synovial fluid suggests there has been bleeding into the joint.
  • #/area; Discocytes; Erthrocyte; Erythrocyte; HEMATOLOGY/CELL COUNTS; Joint aspirate; Joint fld; Joint flu; Joint fluid; LM; Micro; Micros; Microscopic; 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; SF; SNV; Syn; Syn fl; Synov; Synovial fluid

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 (Syn fld) [#/Area]Erythrocytes [#/area] in Synovial fluid by Microscopy high power fieldRBC #/area Snv HPFErythrocytesHEM/BCRed Blood Cell (RBC) Count, Synovial fluidNaric

Frequently asked questions

Code details

Code75237-8
SystemLOINC
Display nameRBC LM.HPF (Syn fld) [#/Area]
DescriptionErythrocytes
Short nameRBC #/area Snv HPF
ComponentErythrocytes
PropertyNaric
TimingPt
System (specimen)Synv fld
ScaleQn
MethodMicroscopy.light.HPF
ClassHEM/BC
Example units/HPF
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.48
Last changed2.48

Consumer names

Red Blood Cell (RBC) Count, Synovial fluid

Part names

ErythrocytesNaricPtSynv fldQnMicroscopy.light.HPFNumber Areic (per area)Point in time (spot)Synovial fluidMicroscopy 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.