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 21550-9: Synovial lining cells LM Ql (Syn fld)

Name: LOINC Code 21550-9: Synovial lining cells LM Ql (Syn fld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:29.463Z

21550-9 is a LOINC code used to identify Synovial lining cells LM Ql (Syn 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 Synovial lining cells. It is commonly used with the system or sample type Synv 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 Synovial lining cells. It is commonly used with the system or sample type Synv 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

Synovial lining cells [Presence] in Synovial fluid by Light microscopy
Synovial lining cells
Cell; Cellularity; HEMATOLOGY/CELL COUNTS; Joint aspirate; Joint fld; Joint flu; Joint fluid; Joint space; LM; Micro; Micros; Microscopic; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; SF; SNV; Syn; Syn fl; Synov; Synovial fluid; Synoviocytes

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

Synovial lining cells LM Ql (Syn fld)Synovial lining cells [Presence] in Synovial fluid by Light microscopySynoviocytes Snv Ql MicroSynovial lining cellsHEM/BCSynovial lining cells, Synovial fluidPrThr

Frequently asked questions

Code details

Code21550-9

SystemLOINC

Display nameSynovial lining cells LM Ql (Syn fld)

DescriptionSynovial lining cells

Short nameSynoviocytes Snv Ql Micro

ComponentSynovial lining cells

PropertyPrThr

TimingPt

System (specimen)Synv fld

ScaleOrd

MethodMicroscopy.light

ClassHEM/BC

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.73

Consumer names

Synovial lining cells, Synovial fluid

Part names

Synovial lining cellsPrThrPtSynv fldOrdMicroscopy.lightPresence or ThresholdPoint in time (spot)Synovial 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.