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 51301-0: CD4 cells/100 cells (BM)

Name: LOINC Code 51301-0: CD4 cells/100 cells (BM)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:35.012Z

51301-0 is a LOINC code used to identify CD4 cells/100 cells (BM) 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 Bone mar.

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 Bone mar.

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 Bone marrow
Cells.CD4/100 cells
BM; BON; Bone marrow; CD4 Cells; Cell; CELL MARKERS; Cellularity; Gated cells; Helper T cells; Inducer T cells; L3T4; Leu3; Leu-3; MAR; Marrow (bone); minimal angle of resolution; Minimum angle of resolution; Number fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; 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 (BM)Deprecated CD4 cells/100 cells in Bone marrowDeprecated CD4 Cells NFr MarCells.CD4/100 cellsCELLMARKCD4 cells per 100 cells, Bone marrowNFr

Frequently asked questions

Code details

Code51301-0

SystemLOINC

Display nameCD4 cells/100 cells (BM)

DescriptionCells.CD4/100 cells

Short nameDeprecated CD4 Cells NFr Mar

ComponentCells.CD4/100 cells

PropertyNFr

TimingPt

System (specimen)Bone mar

ScaleQn

ClassCELLMARK

Example units%

StatusDEPRECATED

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.70

Consumer names

CD4 cells per 100 cells, Bone marrow

Part names

Cells.CD4/100 cellsNFrPtBone marQnNumber FractionPoint in time (spot)Bone marrow

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.