Version 2.77

Term Description

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.
Source: Regenstrief LOINC

Part Description

LP39188-5   Aquaporin 4 water channel Ab.IgG
The water channel aquaporin 4 (AQP4) receptor regulates the water homeostasis in the central nervous system (CNS). Autoantibodies to the AQP4 receptor bind to the receptor and cause neuromyelitis optica (NMO) which is an idiopathic, severe, demyelinating disease of the CNS that primarily affects the optic nerve and spinal cord. Before the discovery of the AQP4 receptor antibody NMO was often misdiagnosed as a variant of multiple sclerosis (MS). With improved clinical laboratory tests and distinct immunological and pathological attributes the two diseases are less often confused. Distinguishing MS and NMO is especially important because they have different treatments. Treatment for NMO includes corticosteroids and plasmapheresis; typical medications used to treat MS, such as beta-interferon and glatiramer acetate are not effective against NMO. During the disease process, the aquaporin 4 receptor antibody binds to the aquaporin 4 receptor initiating the activation of complement, inflammatory demyelination and necrosis. Eighty to ninety percent of patients with NMO experience recurrent episodes of optic neuritis and myelitis. Many patients with NMO also have other autoimmune diseases including thyroiditis, systemic lupus erythematosus
and Sjogren's syndrome. PMID: 17706564 Detection of APQ4-IgG is indicative of a relapsing disease. Immediate treatment with immunosuppressive drugs reduces the frequency and disability of future attacks. [http://labmed.ucsf.edu/labmanual/db/dataall/tests/1424.html] Source: Regenstrief LOINC

Fully-Specified Name

Component
Aquaporin 4 water channel Ab.IgG
Property
Titr
Time
Pt
System
CSF
Scale
SemiQn
Method
IF

Additional Names

Short Name
AQP4 H2O channel IgG Titr CSF IF
Display Name
Aquaporin 4 water channel IgG IF (CSF) [Titer]
Consumer Name Alpha Get Info
Aquaporin 4 water channel IgG antibody, Spinal fluid

Basic Attributes

Class
SERO
Type
Laboratory
First Released
Version 2.63
Last Updated
Version 2.75
Change Reason
Release 2.67: CLASS: Corrected Class from CHEM to SERO; COMPONENT: Updated "receptor" to "water channel" per current scientific nomenclature
Order vs. Observation
Both

Member of these Groups Get Info

LOINC Group Group Name
LG32551-0 Aquaporin 4 water channel Ab.IgG|Titr|Pt|CSF

Language Variants Get Info

Tag Language Translation
es-ES Spanish (Spain) Receptor de Acuaporina 4 IgG:Titulo / Factor de dilución:Punto temporal:Líquido Cefalorraquideo:Semicuantitativo:Inmunofluorescencia (IF)
Synonyms: Semicuantitativo
es-MX Spanish (Mexico) Acuaporina 4 canal de agua Ab.IgG:Título:Punto temporal:Fluído espinal cerebral:Cuantitativo:Inmunofluorescencia (IF)
fr-FR French (France) Aquaporine 4 récepteur anticorps IgG:Titre:Ponctuel:Liquide céphalorachidien:Numérique:Immunofluorescence
fr-CA French (Canada) Récepteur Aquaporin 4 , IgG:Titre:Temps ponctuel:LCR:SemiQn:Immunofluorescence
it-IT Italian (Italy) Acquaporina 4, canale idrico Ab.IgG:Titr:Pt:LCS:SemiQn:IF
Synonyms: anticorpi IgG anticorpo Canale idrico dell''acquaporina 4 Immunofluorescenza (IF) Liquido cerebrospinale Punto nel tempo (episodio) Sierologia (anticorpi e la maggior parte degli ant Titolo
nl-NL Dutch (Netherlands) aquaporine 4 waterkanaal As.IgG:titer:moment:liquor cerebrospinalis:semikwantitatief:immunofluorescentie
Synonyms: antistof; antilichaam IF
zh-CN Chinese (China) 水通道蛋白 4 受体 抗体.IgG:滴定度:时间点:脑脊液:半定量型:免疫荧光法
Synonyms: Ab.IgG;IgG;抗体 IgG Ab;自身抗体 CSF CSF;脊髓液;Cerebral spinal fluid;脑脊髓液 Devic 氏综合征 IgG Devic 综合征 IgG Devic氏综合征 Ab.IgG Devic氏综合征抗体.IgG Devic综合征 Ab.IgG Devic综合征抗体.IgG H2O IFA法;IF法;抗补体免疫荧光法;时间分辨荧光法;荧光原位杂交技术;荧光原位杂交法;荧光抗体 NMO Ab.IgG NMO 抗体.IgG 免疫球蛋白 G 效价;滴定浓度;滴定率;滴定量;滴度;稀释倍数;稀释因子;稀释系数 时刻;随机;随意;瞬间 脊液 脊髓液 脑脊液（Cerebral spinal fluid，CSF） 脑脊髓液 血清;血清学;血清学检验项目;血清学检验项目 (非微生物学);血清学检验项目（非微生物学）;血清学检验项目类;血清学检验项目类 (非微生物学);血清学类;血清学类检验项目;血清学类检验项目 (非微生物学);血清学类试验;血清学类试验 (非微生物学);血清学试验;血清学试验 (非微生物学);血清学试验（非微生物学）;血清学试验类 (非微生物学);血清类 视神经脊髓炎 Ab.IgG 视神经脊髓炎 IgG

Example Units

Unit Source
{titer} Example UCUM Units

LOINC Terminology Service (API) using HL7® FHIR® Get Info

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=88056-7