A diagnosis of hemophagocytic lymphohistiocytosis was confirmed with a liver biopsy, accompanied by elevated ferritin levels (33,539 ng/mL), IL-2R levels (5944.2 pg/mL), thrombocytopenia (49 k/μL), anemia (hemoglobin and mean corpuscular volume of 7.3 g/dL and 77.3 fL), and elevated bilirubin (total bilirubin of 3.2 mg/dL). This evidence concerns the gene IL2RA and Thrombocytopenia.