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LOINC Code 41503-4: N. meningitidis B Ag Ql (Body fld)

41503-4 is a LOINC code used to identify N. meningitidis B Ag Ql (Body 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 Neisseria meningitidis serogroup B Ag. It is commonly used with the system or sample type Body fld.

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 Neisseria meningitidis serogroup B Ag. It is commonly used with the system or sample type Body fld.

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

  • Neisseria meningitidis serogroup B Ag [Presence] in Body fluid
  • Neisseria meningitidis serogroup B Ag
  • Antigen; Antigens; B/F; BF; bod; Bodies; Body fluid; Body fluid, unsp; Fl; Fld; FLU; Fluid; Group B; ID; Infectious Disease; InfectiousDisease; Mening; Meningid; Meningitis; Meningo; Meningococcal meningitis; Meningococcus; Microbiology; N men; N men serogroup; N men sg B; N men sg B Ag; N menigitidis; N meningitidis; Neisseria meningitidis group B; Neisseria meningitidis type B; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen

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

N. meningitidis B Ag Ql (Body fld)Neisseria meningitidis serogroup B Ag [Presence] in Body fluidN men sg B Ag Fld QlNeisseria meningitidis serogroup B AgMICRONeisseria meningitidis serogroup B antigen, Body fluidPrThr

Frequently asked questions

Code details

Code41503-4
SystemLOINC
Display nameN. meningitidis B Ag Ql (Body fld)
DescriptionNeisseria meningitidis serogroup B Ag
Short nameN men sg B Ag Fld Ql
ComponentNeisseria meningitidis serogroup B Ag
PropertyPrThr
TimingPt
System (specimen)Body fld
ScaleOrd
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.16
Last changed2.64

Consumer names

Neisseria meningitidis serogroup B antigen, Body fluid

Part names

Neisseria meningitidis serogroup B AgPrThrPtBody fldOrdPresence or ThresholdPoint in time (spot)Body 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 41503-4 | HealthAssure