LOINCActiveBoth

LOINC Code 5866-9: FLUBV Ag IA Ql (Specimen)

5866-9 is a LOINC code used to identify FLUBV Ag IA Ql (Specimen) 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 Influenza virus B Ag. It is commonly used with the system or sample type XXX.

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 Influenza virus B Ag. It is commonly used with the system or sample type XXX.

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: IA

What it does not mean

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

Key facts

  • Influenza virus B Ag [Presence] in Specimen by Immunoassay
  • Influenza virus B Ag
  • Antigen; Antigens; EIA; ELFA; ELISA; Enzyme immunoassay; FLUB; FLUBV; FLUV; IAA; ID; Infectious Disease; InfectiousDisease; Influ; Influenza B; Influenza B virus; MEIA; Microbiology; Misc; Miscellaneous; Ordinal; Other; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Spec; SUDS; To be specified in another part of the message; UniversalLabOrders; Unspecified

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

FLUBV Ag IA Ql (Specimen)Influenza virus B Ag [Presence] in Specimen by ImmunoassayFLUBV Ag Spec Ql IAInfluenza virus B AgMICROInfluenza B (Flu B) antigen, SpecimenPrThr

Frequently asked questions

Code details

Code5866-9
SystemLOINC
Display nameFLUBV Ag IA Ql (Specimen)
DescriptionInfluenza virus B Ag
Short nameFLUBV Ag Spec Ql IA
ComponentInfluenza virus B Ag
PropertyPrThr
TimingPt
System (specimen)XXX
ScaleOrd
MethodIA
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

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

Consumer names

Influenza B (Flu B) antigen, Specimen

Part names

Influenza virus B AgPrThrPtXXXOrdIAPresence or ThresholdPoint in time (spot)Immunoassay

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 5866-9 | HealthAssure