LOINCActiveObservation

LOINC Code 20493-3: Histiocytes/Cells LM (Body fld)

20493-3 is a LOINC code used to identify Histiocytes/Cells LM (Body 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 Histiocytes/Cells. It is commonly used with the system or sample type Body 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 Histiocytes/Cells. It is commonly used with the system or sample type Body 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: Microscopy.light

What it does not mean

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

Key facts

  • Histiocytes/cells in Body fluid by Light microscopy
  • Histiocytes/Cells
  • B/F; BF; bod; Bodies; Body fluid; Body fluid, unsp; Cell; Cellularity; Fl; Fld; FLU; Fluid; HEMATOLOGY/CELL COUNTS; Histiocyte; Histocytes; LM; Micro; Micros; Microscopic; Number fraction; Percent; Point in time; QNT; Quan; Quant; Quantitative; Random

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

Histiocytes/Cells LM (Body fld)Histiocytes/cells in Body fluid by Light microscopyHistiocytes NFr Fld MicroHistiocytes/CellsHEM/BCHistiocytes/cells, Body fluidNFr

Frequently asked questions

Code details

Code20493-3
SystemLOINC
Display nameHistiocytes/Cells LM (Body fld)
DescriptionHistiocytes/Cells
Short nameHistiocytes NFr Fld Micro
ComponentHistiocytes/Cells
PropertyNFr
TimingPt
System (specimen)Body fld
ScaleQn
MethodMicroscopy.light
ClassHEM/BC
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0m
Last changed2.79

Consumer names

Histiocytes/cells, Body fluid

Part names

Histiocytes/CellsNFrPtBody fldQnMicroscopy.lightNumber FractionPoint in time (spot)Body fluidLight microscopy

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 20493-3 | HealthAssure