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LOINC Code 14321-4: H. influenzae B Ag LA Ql (CSF)

14321-4 is a LOINC code used to identify H. influenzae B Ag LA 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 Haemophilus influenzae B 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 Haemophilus influenzae B 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
  • Method: LA

What it does not mean

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

Key facts

  • Haemophilus influenzae B Ag [Presence] in Cerebral spinal fluid by Latex agglutination
  • Haemophilus influenzae B Ag
  • Antigen; Antigens; Cerebral spinal fluid; Cerebrospinal Fl; H flu; H influenza; H influenzae; Haem influ; Haem influ B; Haemoph; HIB; ID; Infectious Disease; InfectiousDisease; Influ; LAT; Latex agglutination; Microbiology; Neuro; Neurology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Spinal Fl; Spinal Fld; Spinal Flu; Spinal 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

H. influenzae B Ag LA Ql (CSF)Haemophilus influenzae B Ag [Presence] in Cerebral spinal fluid by Latex agglutinationHaem influ B Ag CSF Ql LAHaemophilus influenzae B AgMICROHaemophilus influenzae B antigen, Spinal fluidPrThr

Frequently asked questions

Code details

Code14321-4
SystemLOINC
Display nameH. influenzae B Ag LA Ql (CSF)
DescriptionHaemophilus influenzae B Ag
Short nameHaem influ B Ag CSF Ql LA
ComponentHaemophilus influenzae B Ag
PropertyPrThr
TimingPt
System (specimen)CSF
ScaleOrd
MethodLA
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

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

Consumer names

Haemophilus influenzae B antigen, Spinal fluid

Part names

Haemophilus influenzae B AgPrThrPtCSFOrdLAPresence or ThresholdPoint in time (spot)Cerebral spinal fluidLatex agglutination

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 14321-4 | HealthAssure