Entamoeba Histolytica Antibody, IgG
Label Mnemonic: AMOEAB
Epic code: LAB3067
Downtime form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
Commercial Mail-out Laboratory
5231 RCP
Specimen Instructions:
Parallel testing is preferred and convalescent specimens must be received within 30 days from receipt of the acute specimens. Mark specimens plainly as acute or convalescent.
Collection Medium:
Red top tube 5 mL (Clot Activator)
Preferred Minimum: 1 mL serum
Absolute Minimum: 0.1 mL serum
Rejection Criteria:
Contaminated, heat-inactivated, hemolyzed, or severely lipemic specimens.
Delivery Instructions:
Deliver to laboratory immediately after collection.
Turn Around Time:
1-5 days upon receipt at reference laboratory.
Reference Range:
8 U or less: Negative - No significant level of detectable 
E. histolytica IgG antibody.
9-11 U: Equivocal - Repeat testing in 10-14 days may be helpful.
12 U or greater: Positive - IgG antibody to E. histolytica 
detected, suggestive of a current or past infection.
Interpretive Data:
Seroconversion between acute and convalescent sera is considered strong evidence of recent infection. The best evidence for infection is a significant change on two appropriately timed specimens where both tests are done in the same laboratory at the same time.

Note: In the case of extraintestinal complications, a positive antibody can indicate amebiasis even though stool findings are negative.
Semi-Quantitative Enzyme-Linked Immunosorbent Assay
CPT Code:
See Additional Information:
Specimens Requiring Immediate Delivery