LOINC Code 18213-9: Complement C1 esterase inhibitor free IgM [Mass/Vol]
18213-9 is a LOINC code used to identify Complement C1 esterase inhibitor free 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 free Ab.IgM. It is commonly used with the system or sample type Ser/Plas.
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 free 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 free IgM Ab [Mass/volume] in Serum or Plasma
- Complement C1 esterase inhibitor free Ab.IgM
- ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; C1 inactivator; C1 inhibiting factor; C1INA; C1INH; C1-INH; C1INH Free; Comp; Complmt; FR; HEMATOLOGY/CELL COUNTS; Immune globulin M; Immunoglobulin M; Inhib; Inhibit; Level; Mass concentration; Non-protein bound; 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
Frequently asked questions
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.