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 20999-9: Cell Fractions/Differential (Body fld) [Interp]

Name: LOINC Code 20999-9: Cell Fractions/Differential (Body fld) [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:29.457Z

20999-9 is a LOINC code used to identify Cell Fractions/Differential (Body fld) [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 Body fld.

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 Body 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: Observation

What it does not mean

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

Key facts

Cell Fractions/Differential [Interpretation] in Body fluid
Cell fractions
B/F; BF; bod; Bodies; Body fluid; Body fluid, unsp; Differential count; Fl; Fld; FLU; Fluid; Frac; Fract; Fraction; Fractionated; Fractionation; HEMATOLOGY/CELL COUNTS; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Nominal; Point in time; Random

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 (Body fld) [Interp]Cell Fractions/Differential [Interpretation] in Body fluidCell Fract Fld-ImpCell fractionsHEM/BCCell fractions/Differential, Body fluidImp

Frequently asked questions

Code details

Code20999-9

SystemLOINC

Display nameCell Fractions/Differential (Body fld) [Interp]

DescriptionCell fractions

Short nameCell Fract Fld-Imp

ComponentCell fractions

PropertyImp

TimingPt

System (specimen)Body fld

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, Body fluid

Part names

Cell fractionsImpPtBody fldNomCell Fractions/DifferentialImpression/interpretation of studyPoint in time (spot)Body 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.