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 20998-1: Cell Fractions/Differential (CSF) [Interp]

Name: LOINC Code 20998-1: Cell Fractions/Differential (CSF) [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:29.457Z

20998-1 is a LOINC code used to identify Cell Fractions/Differential (CSF) [Interp] 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 Cell fractions. It is commonly used with the system or sample type CSF.

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 Cell fractions. 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

What it does not mean

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

Key facts

Cell Fractions/Differential [Interpretation] in Cerebral spinal fluid
Cell fractions
Cerebral spinal fluid; Cerebrospinal Fl; Differential count; Frac; Fract; Fraction; Fractionated; Fractionation; HEMATOLOGY/CELL COUNTS; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Nominal; Point in time; Random; 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.

Common synonyms

Cell Fractions/Differential (CSF) [Interp]Cell Fractions/Differential [Interpretation] in Cerebral spinal fluidCell Fract CSF-ImpCell fractionsHEM/BCCell fractions/Differential, Spinal fluidImp

Frequently asked questions

Code details

Code20998-1

SystemLOINC

Display nameCell Fractions/Differential (CSF) [Interp]

DescriptionCell fractions

Short nameCell Fract CSF-Imp

ComponentCell fractions

PropertyImp

TimingPt

System (specimen)CSF

ScaleNom

ClassHEM/BC

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.73

Consumer names

Cell fractions/Differential, Spinal fluid

Part names

Cell fractionsImpPtCSFNomCell Fractions/DifferentialImpression/interpretation of studyPoint in time (spot)Cerebral spinal fluid

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.