LOINCActiveObservation

LOINC Code 51371-3: CD8+HLA-DR+ cells/Cells (CSF)

51371-3 is a LOINC code used to identify CD8+HLA-DR+ cells/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.CD8+HLA-DR+/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.CD8+HLA-DR+/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: ACTIVE
  • Order vs observation: Observation

What it does not mean

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

Key facts

  • CD8+HLA-DR+ cells/cells in Cerebral spinal fluid
  • Cells.CD8+HLA-DR+/Cells
  • CD8 Cells; CD8+HLA-DR+ Cells; Cell; CELL MARKERS; Cellularity; Cerebral spinal fluid; Cerebrospinal Fl; Human Leukocyte Antigen; I3; Leu2; Leu-2; Number fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Suppressor T cells; T8; T-8; Tsuppressor

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

CD8+HLA-DR+ cells/Cells (CSF)CD8+HLA-DR+ cells/cells in Cerebral spinal fluidCD8+HLA-DR+ Cells NFr CSFCells.CD8+HLA-DR+/CellsCELLMARKCD8+HLA-DR+ cells/cells, Spinal fluidNFr

Frequently asked questions

Code details

Code51371-3
SystemLOINC
Display nameCD8+HLA-DR+ cells/Cells (CSF)
DescriptionCells.CD8+HLA-DR+/Cells
Short nameCD8+HLA-DR+ Cells NFr CSF
ComponentCells.CD8+HLA-DR+/Cells
PropertyNFr
TimingPt
System (specimen)CSF
ScaleQn
ClassCELLMARK
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.22
Last changed2.79

Consumer names

CD8+HLA-DR+ cells/cells, Spinal fluid

Part names

Cells.CD8+HLA-DR+/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.

LOINC Code 51371-3 | HealthAssure