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LOINC Code 55309-9: Yeast.pseudohyphae KOH prep Ql (Sput)

55309-9 is a LOINC code used to identify Yeast.pseudohyphae KOH prep 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 Yeast.pseudohyphae. It is commonly used with the system or sample type Sputum.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Yeast.pseudohyphae. 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: KOH preparation

What it does not mean

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

Key facts

Yeast.pseudohyphae [Presence] in Sputum by KOH preparation
Yeast.pseudohyphae
A KOH Preparation involves treating a specimen with KOH, a strong base that can make fungi and yeast more visible by partial dissolution of tissue cells, keratin, and other material. Fungal cells are resistant due to the high content of cellular chitin. KOH prep is generally a test for fungi, most often candida yeast, but others too, such as tinea capitis and other skin or nail fungal infections, even blastomycosis, etc. However, the KOH prep is also used to diagnose infections with mites (Demodex folliculorum in rosacea-like lesions and Sarcoptes scabiei in hyperkeratotic or crusted scabies) and sometimes even nematodes (in blue neck syndrome). [PMID16766846]
ID; Infectious Disease; InfectiousDisease; Lower respiratory; Lung; Microbiology; Ordinal; Point in time; Potassium hydroxide preparation; PR; Prep; Pulmonary; Pulmonology; Ql; Qual; Qualitative; Random; Respiratory; Screen; Spt; Sputum; Yeast pseudohyphae

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

Yeast.pseudohyphae KOH prep Ql (Sput)Yeast.pseudohyphae [Presence] in Sputum by KOH preparationYeast pseudohyphae Spt Ql KOH PrepYeast.pseudohyphaeMICROSputum KOH testPrThr

Frequently asked questions

Code details

Code55309-9
SystemLOINC
Display nameYeast.pseudohyphae KOH prep Ql (Sput)
DescriptionYeast.pseudohyphae
Short nameYeast pseudohyphae Spt Ql KOH Prep
ComponentYeast.pseudohyphae
PropertyPrThr
TimingPt
System (specimen)Sputum
ScaleOrd
MethodKOH preparation
ClassMICRO
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.27
Last changed2.58

Consumer names

Sputum KOH test

Part names

Yeast.pseudohyphaePrThrPtSputumOrdKOH preparationPresence 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 55309-9 | HealthAssure