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 18211-3: Complement C1 esterase inhibitor bound IgM [Mass/Vol]

Name: LOINC Code 18211-3: Complement C1 esterase inhibitor bound IgM [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:27.586Z

18211-3 is a LOINC code used to identify Complement C1 esterase inhibitor bound IgM [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 Complement C1 esterase inhibitor bound Ab.IgM. It is commonly used with the system or sample type Ser/Plas.

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 Complement C1 esterase inhibitor bound Ab.IgM. It is commonly used with the system or sample type Ser/Plas.

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

Complement C1 esterase inhibitor bound IgM Ab [Mass/volume] in Serum or Plasma
Complement C1 esterase inhibitor bound Ab.IgM
ABS; Aby; Antby; Anti; Antibodies; Antibody; Associated; Autoantibodies; Autoantibody; bnd; C1 inactivator; C1 inhibiting factor; C1INA; C1INH; C1-INH; C1INH Bnd; Comp; Complmt; HEMATOLOGY/CELL COUNTS; Immune globulin M; Immunoglobulin M; Inhib; Inhibit; Level; Mass concentration; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; Random; SerP; SerPl; SerPlas; Serum; Serum or plasma; 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.

Common synonyms

Complement C1 esterase inhibitor bound IgM [Mass/Vol]Complement C1 esterase inhibitor bound IgM Ab [Mass/volume] in Serum or PlasmaC1INH Bnd IgM SerPl-mCncComplement C1 esterase inhibitor bound Ab.IgMHEM/BCComplement C1 Esterase Inhibitor Bound IgM antibody, BloodMCnc

Frequently asked questions

Code details

Code18211-3

SystemLOINC

Display nameComplement C1 esterase inhibitor bound IgM [Mass/Vol]

DescriptionComplement C1 esterase inhibitor bound Ab.IgM

Short nameC1INH Bnd IgM SerPl-mCnc

ComponentComplement C1 esterase inhibitor bound Ab.IgM

PropertyMCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassHEM/BC

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.34

Consumer names

Complement C1 Esterase Inhibitor Bound IgM antibody, Blood

Part names

Complement C1 esterase inhibitor bound Ab.IgMMCncPtSer/PlasQnComplement C1 Esterase Inhibitor Bound IgMMass ConcentrationPoint in time (spot)Serum or Plasma

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.