Which of the following laboratory tests is used to detect the presence of weak or dormant antibodies in a patient's serum, which may not be detectable by routine antibody screening?

A Indirect Coombs test
B Direct Coombs test
C Enzyme-linked immunosorbent assay (ELISA) ✓
D Cold agglutinin test

Explanation

The ELISA test is used to detect the presence of weak or dormant antibodies in a patient's serum, which may not be detectable by routine antibody screening.

Source

Technical Manual of the American Association of Blood Banks
Hematology Hematology: Blood Grouping and Crossmatching Hematology: Blood Grouping and Crossmatching Hard MEDICAL Confidence: medium