Testing on formalin-fixed neutrophils is less sensitive and specific for small vessel vasculitis, and less sensitive for MPO-ANCA, than most ELISAs.
J Immunol Methods
; 339(2): 141-5, 2008 Dec 31.
Article
in En
| MEDLINE
| ID: mdl-18823991
ABSTRACT
This study evaluated the usefulness of testing sera with perinuclear antineutrophil cytoplasmic antibodies (P-ANCA) on formalin-fixed neutrophils to differentiate between vasculitis and other diseases, and to distinguish between myeloperoxidase (MPO) and other antigen targets. Sera from active (n=24) or treated vasculitis (n=23) and non-vasculitic disease (n=37) were tested in 3 ethanol- and 2 formalin-fixed neutrophil assays, and in 12 MPO-ANCA ELISAs. The sensitivity of demonstrating that P-ANCA became cytoplasmic on formalin-fixed cells in vasculitis, and negative in non-vasculitic disease was 75-79% in different assays compared with 88% for positivity in the majority of MPO-ANCA ELISAs. The sensitivity and specificity of demonstrating that P-ANCA became cytoplasmic where the target was MPO, and disappeared with other antigens were 89% and 74-80% respectively in different assays. P-ANCA specificity for MPO should be confirmed in one of the better-performing MPO-ANCA ELISAs.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Vasculitis
/
Tissue Fixation
/
Peroxidase
/
Antibodies, Antineutrophil Cytoplasmic
/
Fixatives
/
Formaldehyde
/
Neutrophils
Type of study:
Diagnostic_studies
Limits:
Female
/
Humans
/
Male
Language:
En
Journal:
J Immunol Methods
Year:
2008
Document type:
Article
Affiliation country:
Australia