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LOINC Code 40631-4: Nucleated RBC/Leukocytes Manual cnt (CSF) [Ratio]

40631-4 is a LOINC code used to identify Nucleated RBC/Leukocytes Manual cnt (CSF) [Ratio] 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 Erythrocytes.nucleated/Leukocytes. It is commonly used with the system or sample type CSF.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Erythrocytes.nucleated/Leukocytes. 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
  • Method: Manual count

What it does not mean

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

Key facts

  • Nucleated erythrocytes/Leukocytes [Ratio] in Cerebral spinal fluid by Manual count
  • Erythrocytes.nucleated/Leukocytes
  • Cerebral spinal fluid; Cerebrospinal Fl; Discocytes; Erthrocyte; Erythroblasts; Erythrocyte; HEMATOLOGY/CELL COUNTS; Leuc; Leuk; Leukocyte; Lkcs; Manl; Normoblasts; nRBC; nRBCs; Nuc; Point in time; QNT; Quan; Quant; Quantitative; Random; Ratios; RBC; RBCS; Red blood cell; Red blood cells; Red blood corpuscle; Red blood corpusles; Red cell; Red cells; Rto; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; WBC; WBCs; White blood cell; White blood cells

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

Nucleated RBC/Leukocytes Manual cnt (CSF) [Ratio]Nucleated erythrocytes/Leukocytes [Ratio] in Cerebral spinal fluid by Manual countnRBC CSF Manual-RtoErythrocytes.nucleated/LeukocytesHEM/BCNucleated red blood cells/White Blood Cells, Spinal fluidRatio

Frequently asked questions

Code details

Code40631-4
SystemLOINC
Display nameNucleated RBC/Leukocytes Manual cnt (CSF) [Ratio]
DescriptionErythrocytes.nucleated/Leukocytes
Short namenRBC CSF Manual-Rto
ComponentErythrocytes.nucleated/Leukocytes
PropertyRatio
TimingPt
System (specimen)CSF
ScaleQn
MethodManual count
ClassHEM/BC
Example units/100 WBC
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.15
Last changed2.79

Consumer names

Nucleated red blood cells/White Blood Cells, Spinal fluid

Part names

Erythrocytes.nucleated/LeukocytesRatioPtCSFQnManual countPoint 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 40631-4 | HealthAssure