Which hereditary disease has the following characteristics:…

Which hereditary disease has the following characteristics: Laboratory findings – poikilocytosis with fragmentation, microspherocytosis, and elliptocytosis similar to that in patients with thermal burns. The MCV is very low (50 to 65 fL)  the RBCs show marked thermal sensitivity. After incubation of a blood specimen at 41° to 45° C, the RBCs fragment.