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LOINC Code 74822-8: C. difficile toxin B tcdB gene NAA+probe Ql (Stl)

74822-8 is a LOINC code used to identify C. difficile toxin B tcdB gene NAA+probe Ql (Stl) 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 Clostridioides difficile toxin B tcdB gene. It is commonly used with the system or sample type Stool.

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 Clostridioides difficile toxin B tcdB gene. It is commonly used with the system or sample type Stool.

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: Probe.amp.tar

What it does not mean

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

Key facts

  • Clostridioides difficile toxin B tcdB gene [Presence] in Stool by NAA with probe detection
  • Clostridioides difficile toxin B tcdB gene
  • Real-time polymerase chain reaction (PCR) assay for the rapid detection of the toxin B gene (tcdB) of Clostridium difficile. Fecal C. difficile toxin testing can aid the diagnosis of C. difficile-associated diarrhea in hospitalized patients.
  • 3 Self-Sustaining Sequence Replication; 3SR SR; Amplif; Amplification; Amplified; Bowel movement; C diff; C diff Tox; C diff Tox B; C diff Tox B tcdB; C difficile; Clostridium difficile; DNA NUCLEIC ACID PROBE; DNA probe; Faecal; Faeces; Fecal; Feces; ID; Infectious Disease; InfectiousDisease; LAT; LCR; Ligase chain reaction; Ligation-activated transcription; Microbiology; NAA+probe; NAAT; NASBA; Nucleic acid sequence based analysis; Ordinal; PCR; Point in time; Polymerase chain reaction; PR; Probe amp; Probe with ampification; Probe with target amplification; QBR; QL; Qual; Qualitative; Random; Screen; SDA; Stl; Stool = Fecal; Strand Displacement Amplification; TMA; Transcription mediated amplification

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

C. difficile toxin B tcdB gene NAA+probe Ql (Stl)Clostridioides difficile toxin B tcdB gene [Presence] in Stool by NAA with probe detectionC diff Tox B tcdB Stl Ql NAA+probeClostridioides difficile toxin B tcdB geneMICROClostridioides difficile toxin B tcdB gene, StoolPrThr

Frequently asked questions

Code details

Code74822-8
SystemLOINC
Display nameC. difficile toxin B tcdB gene NAA+probe Ql (Stl)
DescriptionClostridioides difficile toxin B tcdB gene
Short nameC diff Tox B tcdB Stl Ql NAA+probe
ComponentClostridioides difficile toxin B tcdB gene
PropertyPrThr
TimingPt
System (specimen)Stool
ScaleOrd
MethodProbe.amp.tar
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.48
Last changed2.73

Consumer names

Clostridioides difficile toxin B tcdB gene, Stool

Part names

Clostridioides difficile toxin B tcdB genePrThrPtStoolOrdProbe.amp.tarPresence or ThresholdPoint in time (spot)Nucleic acid amplification with probe detection

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.