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LOINC Code 40784-1: S. agalactiae Ag Ql (Vag fld)

40784-1 is a LOINC code used to identify S. agalactiae Ag Ql (Vag fld) 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 Streptococcus agalactiae Ag. It is commonly used with the system or sample type Vag.

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 Streptococcus agalactiae Ag. It is commonly used with the system or sample type Vag.

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

What it does not mean

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

Key facts

  • Streptococcus agalactiae Ag [Presence] in Vaginal fluid
  • Streptococcus agalactiae Ag
  • Antigen; Antigens; GBS; Genital vaginal; Gp B Strep; Group B; Group B Strep; Gyn; Gynecology; ID; Infectious Disease; InfectiousDisease; Microbiology; OB; ObGyn; Obstetrics; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; S agalactiae; Screen; Steptococcus Group B; Strep; Strep B; Strep group B; Strept; Streptococci group B; Vag fld; Vag fluid; Vagina; Vaginal fluid

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

S. agalactiae Ag Ql (Vag fld)Streptococcus agalactiae Ag [Presence] in Vaginal fluidGp B Strep Ag Vag QlStreptococcus agalactiae AgMICROStreptococcus agalactiae antigen, Vaginal fluidPrThr

Frequently asked questions

Code details

Code40784-1
SystemLOINC
Display nameS. agalactiae Ag Ql (Vag fld)
DescriptionStreptococcus agalactiae Ag
Short nameGp B Strep Ag Vag Ql
ComponentStreptococcus agalactiae Ag
PropertyPrThr
TimingPt
System (specimen)Vag
ScaleOrd
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.15
Last changed2.73

Consumer names

Streptococcus agalactiae antigen, Vaginal fluid

Part names

Streptococcus agalactiae AgPrThrPtVagOrdPresence or ThresholdPoint in time (spot)Vaginal

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.