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LOINC Code 6506-0: N. meningitidis w135 Ag IF Ql (CSF)

6506-0 is a LOINC code used to identify N. meningitidis w135 Ag IF 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 Neisseria meningitidis serogroup w135 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 Neisseria meningitidis serogroup w135 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: IF

What it does not mean

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

Key facts

  • Neisseria meningitidis serogroup w135 Ag [Presence] in Cerebral spinal fluid by Immunofluorescence
  • Neisseria meningitidis serogroup w135 Ag
  • ACIF; Anticomplement Immunofluorescence; Antigen; Antigens; Cerebral spinal fluid; Cerebrospinal Fl; DFA; FA; Fluorescent antibody; Fluoresent; ID; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Infectious Disease; InfectiousDisease; Mening; Meningid; Meningitis; Meningo; Meningococcal meningitis; Meningococcus; Microbiology; N men; N men serogroup; N men sg W135; N men sg w135 Ag; N menigitidis; N meningitidis; Neisseria meningitidis group w135; Neisseria meningitidis type w135; Neuro; Neurology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Time Resolved Fluorescence; TRF

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 w135 Ag IF Ql (CSF)Neisseria meningitidis serogroup w135 Ag [Presence] in Cerebral spinal fluid by ImmunofluorescenceN men sg W135 Ag CSF Ql IFNeisseria meningitidis serogroup w135 AgMICRONeisseria meningitidis serogroup w135 antigen, Spinal fluidPrThr

Frequently asked questions

Code details

Code6506-0
SystemLOINC
Display nameN. meningitidis w135 Ag IF Ql (CSF)
DescriptionNeisseria meningitidis serogroup w135 Ag
Short nameN men sg W135 Ag CSF Ql IF
ComponentNeisseria meningitidis serogroup w135 Ag
PropertyPrThr
TimingPt
System (specimen)CSF
ScaleOrd
MethodIF
ClassMICRO
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0g
Last changed2.64

Consumer names

Neisseria meningitidis serogroup w135 antigen, Spinal fluid

Part names

Neisseria meningitidis serogroup w135 AgPrThrPtCSFOrdIFPresence or ThresholdPoint in time (spot)Cerebral spinal fluidImmunofluorescence (IF)

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 6506-0 | HealthAssure