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.

LOINCObservation

LOINC Code 42194-1: CD4 cells/100 cells (CSF)

Name: LOINC Code 42194-1: CD4 cells/100 cells (CSF)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:28.127Z

42194-1 is a LOINC code used to identify CD4 cells/100 cells (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 Cells.CD4/100 cells. 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 Cells.CD4/100 cells. 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: DEPRECATED
Order vs observation: Observation

What it does not mean

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

Key facts

Deprecated CD4 cells/100 cells in Cerebral spinal fluid
Cells.CD4/100 cells
CD4 Cells; Cell; CELL MARKERS; Cellularity; Cerebral spinal fluid; Cerebrospinal Fl; Gated cells; Helper T cells; Inducer T cells; L3T4; Leu3; Leu-3; Number fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; T4; T-4; W3/25

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

CD4 cells/100 cells (CSF)Deprecated CD4 cells/100 cells in Cerebral spinal fluidDeprecated CD4 Cells NFr CSFCells.CD4/100 cellsCELLMARKCD4 cells per 100 cells, Spinal fluidNFr

Frequently asked questions

Code details

Code42194-1

SystemLOINC

Display nameCD4 cells/100 cells (CSF)

DescriptionCells.CD4/100 cells

Short nameDeprecated CD4 Cells NFr CSF

ComponentCells.CD4/100 cells

PropertyNFr

TimingPt

System (specimen)CSF

ScaleQn

ClassCELLMARK

Example units%

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.16

Last changed2.36

Consumer names

CD4 cells per 100 cells, Spinal fluid

Part names

Cells.CD4/100 cellsNFrPtCSFQnNumber FractionPoint 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.