LOINC
Version 2.73

29570-9West Nile virus neutralizing antibody [Titer] in Cerebral spinal fluid by Neutralization testActive

Part Descriptions

LP28423-9   West Nile virus
The West Nile Virus (WNV) is an arbovirus that was first identified in the West Nile District of Uganda in 1937. In the fall of 1999, the National Veterinary Services Laboratory (NVLS) isolated WNV in a dead crow in New York City.(http://www.who.int/mediacentre/factsheets/fs354/en/) Over the following ten years, WNV spread throughout the United States, Canada, Mexico and the Carribbean. WNV is usually transmitted through the bite of the Culex mosquito, but can also be spread in blood transfusions, organ transplants, breast milk, intrauterine exposure and laboratory-acquired infections. Birds are the preferred host of WNV, and the American robin is an important amplifier host since it develops enough virus in its serum to infect feeding mosquitoes. Though most infections with WNV are subclinical for humans, between 2005 and 2009 there were 12,975 people infected with WNV, of which 35% had severe cases of neuroinvasive disease and 496 people died. For individuals who are 70 years of age or older, infection with WNV has a 15-29% fatality rate. For infants and immunocompromised patients infected with WNV, the fatality rate is even higher. Diagnosis of WNV is based on clinical symptoms and antibody titers. The IgM antibody-capture enzyme-linked immunosorbent assay (MAC-ELISA) is the key method used to diagnosis WNV in clinical settings. Antibody titers to WNV NS5 are detectable long-term in vivo and can be used to distinguish past infection with WNV from current infection. RNA is usually undetectable in serum after 13.2 days, but on rare occasions, has been found in serum beyond 40 days. Treatment of infection with WNV is mostly supportive. There are no FDA-approved drugs or vaccines available.[PMID:12089283][PMID:23034323] Source: Regenstrief LOINC

LP6416-4   Neut
In LOINC, the Method "Neut" represents the virus neutralization test (VNT), also called conventional VNT, which is a specific laboratory method that is used primarily for identifying whether neutralizing antibodies for the virus of interest are present in the patient sample. The VNT involves incubating patient serum with the virus of interest, and then inoculating onto cell culture. If neutralizing antibodies are present and the virus is neutralized, the cells will not be infected. If neutralizing antibodies are not present, the virus will infect the cells in the cell culture. [PMID:32170698] This method can also be used to identify specific virus serotypes or strains, by performing separate tests in which serum is incubated with each of the specific virus serotypes or strains of interest. [PMID:169804] Source: Regenstrief LOINC

LP207365-0   Ab.Neut
Neutralizing antibodies are antibodies that interfere with the interaction between the virus and its host cell receptor, therefore preventing infectivity. Neutralizing antibodies can be detected using a traditional VNT or other methods such as pseudovirus VNT and surrogate VNT. VNT and pseudovirus VNT use live virus (the actual virus or a recombinant virus that incorporates the viral antigen of interest, respectively) and cell culture to assess the virus-host interaction and whether neutralizing antibodies are present that block that interaction. Surrogate VNT (sVNT) does not use live virus but rather uses purified viral antigen and host cell receptor protein to mimic the same interaction. The sVNT method is currently (2021) represented in LOINC as IA, because it is an immunoassay-based method. Source: Regenstrief LOINC

Fully-Specified Name

Component
West Nile virus Ab.Neut
Property
Titr
Time
Pt
System
CSF
Scale
Qn
Method
Neut

Additional Names

Short Name
WNV NAb Titr CSF Nt
Display Name
West Nile virus neut ab Neut test (CSF) [Titer]
Consumer Name Alpha
West Nile virus neutralizing antibody, Spinal fluid

Basic Attributes

Class
MICRO
Type
Laboratory
First Released
Version 2.03
Last Updated
Version 2.72
Change Reason
Release 2.72: COMPONENT: Updated "Ab" to "Ab.Neut" since this test is detecting neutralizing antibodies.;
Order vs. Observation
Both

Member of these Groups

LG32768-0 West Nile virus

Language Variants Get Info

zh-CNChinese (China)
西尼罗河病毒 抗体.中和:滴定度:时间点:脑脊液:定量型:中和试验
nl-NLDutch (Netherlands)
West-Nijlvirus As.neutraliserend:titer:moment:liquor cerebrospinalis:kwantitatief:neutralisatietest
fr-CAFrench (Canada)
Virus du Nil occidental Ac.neut:Titre:Temps ponctuel:LCR:Quantitatif:Test de neutralisation
fr-FRFrench (France)
West Nile virus Ac:Titre:Ponctuel:Liquide céphalorachidien:Numérique:Neutralisation
de-DEGerman (Germany)
West-Nil-Virus Ak.neutralisierend:Titer:Zeitpunkt:Zerebrospinalflüssigkeit:Quantitativ:Neutralisationstest
it-ITItalian (Italy)
Nilo occidentale, virus Ab.Neut:Titr:Pt:LCS:Qn:Neut
ko-KRKorean (Korea, Republic of)
웨스트 나일 바이러스 항체:역가:검사시점:뇌척수액:정량:중화
pt-BRPortuguese (Brazil)
Vírus do Nilo Ocidental Ac:Título:Pt:LCR:Qn:Teste de neutralização
es-ARSpanish (Argentina)
anticuerpo contra virus del Nilo occidental:factor de dilución (titulación):punto en el tiempo:líquido cefalorraquídeo:cuantitativo:neutralización
es-MXSpanish (Mexico)
Ab virus del Nilo Occidental:Título:Punto temporal:Fluído espinal cerebral:Cuantitativo:Prueba de neutralización
es-ESSpanish (Spain)
Virus Nilo Occidental Anticuerpos antineutrófilos:Titulo / Factor de dilución:Punto temporal:Líquido Cefalorraquideo:Qn:Prueba de neutralización

Example Units

Unit Source
{titer} Example UCUM Units

LOINC FHIR® API Example - CodeSystem Request Get Info

https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=29570-9