LOINC Code 80221-5: NMDAR IgG IF (S) [Titer]

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 N-methyl-D-aspartate receptor 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
• Method: IF

What it does not mean

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

Key facts

• NMDAR IgG Ab [Titer] in Serum by Immunofluorescence
• N-methyl-D-aspartate receptor Ab.IgG
• Semi-quanitative analysis of N-methyl-D-aspartate receptor IgG antibodies in serum to confirm the diagnosis of anti-NMDAR autoimmune encephalitis in conjunction with other laboratory and clinical findings. This test may also be used to monitor treatment response in individuals who are antibody positive. This term was created for, but not limited in use to, the EUROIMMUN Anti-Glutamate receptor (type NMDA) IFA assay.
• ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; Asp; Aspartic acid; Autoantibodies; Autoantibody; Dextro; Dilution factor; Dilution Factor (Titer); Encephalitis; FA; Fluorescent antibody; Fluoresent; IFA; Immune fluorescence; Immune globulin G; Immunoflour; Immunofluor; Immunofluorescence; Immunoglobulin G; NMDA receptor; NMDAR; N-Methylaspartate Receptors; N-Methyl-D-aspartic Acid; Point in time; Random; Rec; Recept; Receptors; Recp; Recptr; Serology; Serum; SmQn; SR; Time Resolved Fluorescence; Titer; Titered; Titre; TRF; Ttr

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