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 18289-9: RBC LM Nom (CSF)

Name: LOINC Code 18289-9: RBC LM Nom (CSF)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

18289-9 is a LOINC code used to identify RBC LM Nom (CSF) 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 CSF.

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 CSF.

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

What it does not mean

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

Key facts

Erythrocytes [Morphology] in Cerebral spinal fluid by Light microscopy
Erythrocytes
Cerebral spinal fluid; Cerebrospinal Fl; Discocytes; Erthrocyte; Erythrocyte; HEMATOLOGY/CELL COUNTS; LM; Micro; Micros; Microscopic; Morphology; Nominal; Point in time; Random; RBC; RBCS; Red blood cell; Red blood cells; Red blood corpuscle; Red blood corpusles; Red cell; Red cells; Spinal Fl; Spinal Fld; Spinal Flu; Spinal 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for RBC LM Nom (CSF) (18289-9)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

RBC LM Nom (CSF)Erythrocytes [Morphology] in Cerebral spinal fluid by Light microscopyRBC CSF MicroErythrocytesHEM/BCRed Blood Cell (RBC) Count, Spinal fluidMorph

Frequently asked questions

Code details

Code18289-9

SystemLOINC

Display nameRBC LM Nom (CSF)

DescriptionErythrocytes

Short nameRBC CSF Micro

ComponentErythrocytes

PropertyMorph

TimingPt

System (specimen)CSF

ScaleNom

MethodMicroscopy.light

ClassHEM/BC

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.07

Consumer names

Red Blood Cell (RBC) Count, Spinal fluid

Part names

ErythrocytesMorphPtCSFNomMicroscopy.lightMorphologyPoint in time (spot)Cerebral spinal fluidLight microscopy

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.