CBC, LFTs, LDH, haptoglobin
Direct Coombs test - blood sample is removed of plasma and incubated with anti-human immunoglobulin (aka "Coombs reagent"). This detects if autoantibodies are attached to RBCs or compliment. If the RBCs are coated with IgG (positive direct Coombs test), this suggests the diagnosis of "warm<unk> . If the RBCs are coated with only compliment, this suggests the diagnosis of "cold"<unk>
Autoimmune hemolytic anemia
Hemorrhage
Microangiopathic hemolytic anemia
Hereditary
Hemolytic anemia
Acquired
Paroxysmal nocturnal hemoglobinuria
Microangiopathic Hemolytic Anemia 