Helicobacter pylori Antibody, IgA
|Epic Lab Code:||LAB157|
|Order Form:||A-1a Miscellaneous Request or Epic Req|
Commercial Mail-out Laboratory
|Red top tube|
Adult preferred minimum: .5 mL serum Adult absolute minimum: 0.3 mL serum Pediatric minimum: 0.1 mL serum
Severely lipemic, contaminated, heat-inactivated, or hemolyzed specimens.
Submit specimen to laboratory as soon as possible after collection.
Turn Around Time:
1 week upon receipt at reference laboratory
1.7 EV or less: Negative - No significant level of IgA antibody to H. pylori detected. 1.8-2.2 EV: Equivocal - Repeat testing in 10-14 days may be helpful. 2.3 EV or greater: Positive - IgA antibody to H. pylori detected, suggestive of active infection.
Helicobacter pylori IgG and IgA antibody seroconversion occur together after 60 days. Samples that have a high titer of both IgG and IgA antibodies to H. pylori in symptomatic individuals may be considered to represent an active infection. However, a positive H. pylori IgA result can only suggest active infection and should be confirmed by bacterial isolation or other diagnostic testing.