MS-2987

MS-2987

A 60-year-old male comes to you with complaints of fatigue and difficulty breathing for the past 2 months. During the physical examination, you observe that the patient is visibly jaundiced and the spleen is palpable. Upon conducting blood tests, the following results are obtained:

Hb 98 g/l
MCV 88 fl
Direct Coombs test Pos

Further testing is done to determine the antibody specificity, and the patient is diagnosed with warm autoimmune haemolytic anaemia. Which immunoglobulin is most likely responsible for mediating this condition?