What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 42985-2: N. meningitidis C IgG (S) [Mass/Vol]

Name: LOINC Code 42985-2: N. meningitidis C IgG (S) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

42985-2 is a LOINC code used to identify N. meningitidis C IgG (S) [Mass/Vol] 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 C Ab.IgG. It is commonly used with the system or sample type Ser.

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 C Ab.IgG. It is commonly used with the system or sample type Ser.

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 C IgG Ab [Mass/volume] in Serum
Neisseria meningitidis serogroup C Ab.IgG
ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Level; Mass concentration; Mening; Meningid; Meningitis; Meningo; Meningococcal meningitis; Meningococcus; Microbiology; N men; N men serogroup; N men sg C; N men sg C IgG; N menigitidis; N meningitidis; Neisseria meningitidis group C; Neisseria meningitidis type C; Point in time; QNT; Quan; Quant; Quantitative; Random; Rh Blood Group System; Serum; SR

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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for N. meningitidis C IgG (S) [Mass/Vol] (42985-2)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

N. meningitidis C IgG (S) [Mass/Vol]Neisseria meningitidis serogroup C IgG Ab [Mass/volume] in SerumN men sg C IgG Ser-mCncNeisseria meningitidis serogroup C Ab.IgGMICRONeisseria meningitidis serogroup C IgG antibody, BloodMCnc

Frequently asked questions

Code details

Code42985-2

SystemLOINC

Display nameN. meningitidis C IgG (S) [Mass/Vol]

DescriptionNeisseria meningitidis serogroup C Ab.IgG

Short nameN men sg C IgG Ser-mCnc

ComponentNeisseria meningitidis serogroup C Ab.IgG

PropertyMCnc

TimingPt

System (specimen)Ser

ScaleQn

ClassMICRO

Example unitsug/mL

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.16

Last changed2.73

Consumer names

Neisseria meningitidis serogroup C IgG antibody, Blood

Part names

Neisseria meningitidis serogroup C Ab.IgGMCncPtSerQnNeisseria meningitidis serogroup C IgGMass ConcentrationPoint in time (spot)Serum

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.