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.

LOINCActiveBoth

LOINC Code 31191-0: Microscopic observation Cyto stain Nom (Prostate fine needle aspirate)

Name: LOINC Code 31191-0: Microscopic observation Cyto stain Nom (Prostate fine needle aspirate)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:17.663Z

31191-0 is a LOINC code used to identify Microscopic observation Cyto stain Nom (Prostate fine needle aspirate) 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 Prostate.FNA.

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 Prostate.FNA.

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 Prostate fine needle aspirate by Cyto stain
Observation
CYTOLOGY; Cytology stain; Cytostain; Fine needle; Identity or presence; Nominal; Pap Smear; Pap Stain; Papanicolaou smear; Point in time; Prost; Prostate FNA; Prostatic; 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 (Prostate fine needle aspirate)Microscopic observation [Identifier] in Prostate fine needle aspirate by Cyto stainCyto Prostate FNAObservationCYTOMicroscopic observation, Prostate Fine Needle AspiratePrid

Frequently asked questions

Code details

Code31191-0

SystemLOINC

Display nameMicroscopic observation Cyto stain Nom (Prostate fine needle aspirate)

DescriptionObservation

Short nameCyto Prostate FNA

ComponentObservation

PropertyPrid

TimingPt

System (specimen)Prostate.FNA

ScaleNom

MethodCyto stain

ClassCYTO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.07

Last changed2.78

Consumer names

Microscopic observation, Prostate Fine Needle Aspirate

Part names

ObservationPridPtProstate.FNANomCyto stainPresence or IdentityPoint in time (spot)Prostate FNA

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.