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 70066-6: Mononuclear cells/Leukocytes Auto (Pleur fld)

Name: LOINC Code 70066-6: Mononuclear cells/Leukocytes Auto (Pleur fld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:48.867Z

70066-6 is a LOINC code used to identify Mononuclear cells/Leukocytes Auto (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 Mononuclear cells/Leukocytes. It is commonly used with the system or sample type Plr fld.

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 Mononuclear 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
Method: Automated count

What it does not mean

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

Key facts

Mononuclear cells/Leukocytes in Pleural fluid by Automated count
Mononuclear cells/Leukocytes
Auto; Automated detection; Cell; Cellularity; Elec; Elect; Electr; HEMATOLOGY/CELL COUNTS; Leuc; Leuk; Leukocyte; Lkcs; Mononuc; Mononuc Cells; 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.

Common synonyms

Mononuclear cells/Leukocytes Auto (Pleur fld)Mononuclear cells/Leukocytes in Pleural fluid by Automated countMononuc Cells NFr Plr AutoMononuclear cells/LeukocytesHEM/BCMononuclear cells/White Blood Cells, Pleural fluidNFr

Frequently asked questions

Code details

Code70066-6

SystemLOINC

Display nameMononuclear cells/Leukocytes Auto (Pleur fld)

DescriptionMononuclear cells/Leukocytes

Short nameMononuc Cells NFr Plr Auto

ComponentMononuclear cells/Leukocytes

PropertyNFr

TimingPt

System (specimen)Plr fld

ScaleQn

MethodAutomated count

ClassHEM/BC

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.40

Last changed2.79

Consumer names

Mononuclear cells/White Blood Cells, Pleural fluid

Part names

Mononuclear cells/leukocytesNFrPtPlr fldQnAutomated countNumber 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.