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 30431-1: Mesothelial cells/Leukocytes (Pleur fld)

Name: LOINC Code 30431-1: Mesothelial cells/Leukocytes (Pleur fld)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

30431-1 is a LOINC code used to identify Mesothelial cells/Leukocytes (Pleur fld) 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 Mesothelial cells/Leukocytes. It is commonly used with the system or sample type Plr fld.

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 Mesothelial cells/Leukocytes. It is commonly used with the system or sample type Plr 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

Mesothelial cells/Leukocytes in Pleural fluid
Mesothelial cells/Leukocytes
Cell; Cellularity; HEMATOLOGY/CELL COUNTS; Leuc; Leuk; Leukocyte; Lkcs; Mesothl; Mesothl Cell; Number Fraction; Percent; Pleural; Pleural fluid; Point in time; QNT; Quan; Quant; Quantitative; Random; thoracentesis 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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Mesothelial cells/Leukocytes (Pleur fld) (30431-1)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Mesothelial cells/Leukocytes (Pleur fld)Mesothelial cells/Leukocytes in Pleural fluidMesothl Cell NFr PlrMesothelial cells/LeukocytesHEM/BCMesothelial cells/White Blood Cells, Pleural fluidNFr

Frequently asked questions

Code details

Code30431-1

SystemLOINC

Display nameMesothelial cells/Leukocytes (Pleur fld)

DescriptionMesothelial cells/Leukocytes

Short nameMesothl Cell NFr Plr

ComponentMesothelial cells/Leukocytes

PropertyNFr

TimingPt

System (specimen)Plr fld

ScaleQn

ClassHEM/BC

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.04

Last changed2.79

Consumer names

Mesothelial cells/White Blood Cells, Pleural fluid

Part names

Mesothelial cells/leukocytesNFrPtPlr fldQnNumber FractionPoint in time (spot)Pleural 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.