LOINCActiveObservation

LOINC Code 13531-9: Fat.microscopic observation Sudan III stain Ql (Sput)

13531-9 is a LOINC code used to identify Fat.microscopic observation Sudan III stain Ql (Sput) 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 Fat.microscopic observation. It is commonly used with the system or sample type Sputum.

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 Fat.microscopic observation. It is commonly used with the system or sample type Sputum.

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: Sudan III stain

What it does not mean

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

Key facts

  • Fat.microscopic observation [Presence] in Sputum by Sudan III stain
  • Fat.microscopic observation
  • 3; Lower respiratory; Ordinal; PATHOLOGY; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Spt; Sputum; St; Stains; Stn; Sudan III Stn; Sudn

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

Fat.microscopic observation Sudan III stain Ql (Sput)Fat.microscopic observation [Presence] in Sputum by Sudan III stainFat Spt Ql Sudan III StnFat.microscopic observationPATHFat.microscopic observation, SputumPrThr

Frequently asked questions

Code details

Code13531-9
SystemLOINC
Display nameFat.microscopic observation Sudan III stain Ql (Sput)
DescriptionFat.microscopic observation
Short nameFat Spt Ql Sudan III Stn
ComponentFat.microscopic observation
PropertyPrThr
TimingPt
System (specimen)Sputum
ScaleOrd
MethodSudan III stain
ClassPATH
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0k
Last changed2.56

Consumer names

Fat.microscopic observation, Sputum

Part names

Fat.microscopic observationPrThrPtSputumOrdSudan III stainPresence or ThresholdPoint in time (spot)

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 13531-9 | HealthAssure