LOINCActiveBoth

LOINC Code 55604-3: Microscopic observation Cyto stain Nom (Endometrium)

55604-3 is a LOINC code used to identify Microscopic observation Cyto stain Nom (Endometrium) 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 Observation. It is commonly used with the system or sample type Endomet.

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 Observation. It is commonly used with the system or sample type Endomet.

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: Both
  • Method: Cyto stain

What it does not mean

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

Key facts

  • Microscopic observation [Identifier] in Endometrium by Cyto stain
  • Observation
  • CYTOLOGY; Cytology stain; Cytostain; Endm; Endometr; Endometrium; Identity or presence; Nominal; Pap Smear; Pap Stain; Papanicolaou smear; Point in time; Random; St; Stains; Stn

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

Microscopic observation Cyto stain Nom (Endometrium)Microscopic observation [Identifier] in Endometrium by Cyto stainCyto EndometriumObservationCYTOMicroscopic observation, EndometriumPrid

Frequently asked questions

Code details

Code55604-3
SystemLOINC
Display nameMicroscopic observation Cyto stain Nom (Endometrium)
DescriptionObservation
Short nameCyto Endometrium
ComponentObservation
PropertyPrid
TimingPt
System (specimen)Endomet
ScaleNom
MethodCyto stain
ClassCYTO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.27
Last changed2.78

Consumer names

Microscopic observation, Endometrium

Part names

ObservationPridPtEndometNomCyto stainPresence or IdentityPoint in time (spot)Endometrium

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 55604-3 | HealthAssure