Medical Laboratory Scientist (MLS) Examination — ASCP Board Of Certification

A positive Direct Antiglobulin Test (DAT) indicates that:

The patient has unexpected antibodies free in serum The patient's red blood cells are coated with IgG or complement in vivo ABO incompatibility exists between donor and recipient The patient is Rh D positive

Correct Answer:

The patient's red blood cells are coated with IgG or complement in vivo

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