LOINC Code 88056-7: Aquaporin 4 water channel IgG IF (CSF) [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 Aquaporin 4 water channel Ab.IgG. 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

• Aquaporin 4 water channel IgG Ab [Titer] in Cerebral spinal fluid by Immunofluorescence
• Aquaporin 4 water channel Ab.IgG
• In vivo, IgG antibodies against aquaporin-4 (AQP4) cause fluorescence of small cerebral vessels, the pia and subpia, and the Virchow-Robin space on the optic nerve and cerebellar tissue. In vitro, cells transfected with AQP4 show smooth cytoplasmic fluorescence in the presence of AQP4 IgG antibodies with little fluorescence of the nucleus. This term was created for, but is not limited in use to, the Euroimmun NMO-IgG/aquaporin-4 immunofluorescence assay.
• ABS; Aby; ACIF; Antby; Anti; Antibodies; Antibody; Anticomplement Immunofluorescence; AQP4; AQP4 H2O channel; Autoantibodies; Autoantibody; Cerebral spinal fluid; Cerebrospinal Fl; Devic's disease; Dilution factor; Dilution Factor (Titer); FA; Fluorescent antibody; Fluoresent; IFA; Immune fluorescence; Immune globulin G; Immunoflour; Immunofluor; Immunofluorescence; Immunoglobulin G; Neuromyelitis optica; NMO; NMO spectrum disorders; NMOSD; Opticospinal multiple sclerosis; Point in time; Random; Serology; SmQn; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Time Resolved Fluorescence; Titer; Titered; Titre; TRF; Ttr; Water channel aquaporin-4

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