LOINCActiveObservation

LOINC Code 51912-4: G. lamblia+Cryptosporidium sp Ag spec 2 Ql (Stl)

51912-4 is a LOINC code used to identify G. lamblia+Cryptosporidium sp Ag spec 2 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 Giardia lamblia+Cryptosporidium sp Ag^2nd specimen. It is commonly used with the system or sample type Stool.

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 Giardia lamblia+Cryptosporidium sp Ag^2nd specimen. 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: Observation

What it does not mean

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

Key facts

  • Giardia lamblia+Cryptosporidium sp Ag [Presence] in Stool --2nd specimen
  • Giardia lamblia+Cryptosporidium sp Ag^2nd specimen
  • Antigen; Antigens; Beaver fever; Bowel movement; Convalescent; Crypt; Crypto; Cryptosporidiosis; Faecal; Faeces; Fecal; Feces; G duodenalis; G intestinalis; G lamblia; G lamblia+Cryptosp; G lamblia+Cryptosp Ag; Giardiasis; ID; Infectious Disease; InfectiousDisease; Lamblia intestinalis; Microbiology; Ordinal; Point in time; Post immunization; PR; QL; Qual; Qualitative; Random; Screen; Second; sp2; Spec; species; spp; Stl; Stool = Fecal

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

G. lamblia+Cryptosporidium sp Ag spec 2 Ql (Stl)Giardia lamblia+Cryptosporidium sp Ag [Presence] in Stool --2nd specimenG lamblia+Cryptosp Ag sp2 Stl QlGiardia lamblia+Cryptosporidium sp Ag^2nd specimenMICROGiardia lamblia+Cryptosporidium sp antigen specimen 2, StoolPrThr

Frequently asked questions

Code details

Code51912-4
SystemLOINC
Display nameG. lamblia+Cryptosporidium sp Ag spec 2 Ql (Stl)
DescriptionGiardia lamblia+Cryptosporidium sp Ag^2nd specimen
Short nameG lamblia+Cryptosp Ag sp2 Stl Ql
ComponentGiardia lamblia+Cryptosporidium sp Ag^2nd specimen
PropertyPrThr
TimingPt
System (specimen)Stool
ScaleOrd
ClassMICRO
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.24
Last changed2.56

Consumer names

Giardia lamblia+Cryptosporidium sp antigen specimen 2, Stool

Part names

Giardia lamblia+Cryptosporidium sp Ag^2nd specimenPrThrPtStoolOrdPresence 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.