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LOINC Code 20488-3: S. agalactiae Ag Ql (CSF)

20488-3 is a LOINC code used to identify S. agalactiae Ag Ql (CSF) 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 CSF.

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 CSF.

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 Cerebral spinal fluid
  • Streptococcus agalactiae Ag
  • Antigen; Antigens; Cerebral spinal fluid; Cerebrospinal Fl; GBS; Gp B Strep; Group B; Group B Strep; ID; Infectious Disease; InfectiousDisease; Microbiology; Neuro; Neurology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; S agalactiae; Screen; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Steptococcus Group B; Strep; Strep B; Strep group B; Strept; Streptococci group B

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 (CSF)Streptococcus agalactiae Ag [Presence] in Cerebral spinal fluidGp B Strep Ag CSF QlStreptococcus agalactiae AgMICROStreptococcus agalactiae antigen, Spinal fluidPrThr

Frequently asked questions

Code details

Code20488-3
SystemLOINC
Display nameS. agalactiae Ag Ql (CSF)
DescriptionStreptococcus agalactiae Ag
Short nameGp B Strep Ag CSF Ql
ComponentStreptococcus agalactiae Ag
PropertyPrThr
TimingPt
System (specimen)CSF
ScaleOrd
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0m
Last changed2.73

Consumer names

Streptococcus agalactiae antigen, Spinal fluid

Part names

Streptococcus agalactiae AgPrThrPtCSFOrdPresence or ThresholdPoint in time (spot)Cerebral spinal fluid

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 20488-3 | HealthAssure