A 3 year old boy is recently diagnosed with Acute lymphoblastic leukemia/lymphoma. His peripheral blood film is shown below. A bone marrow biopsy is performed and reveals > 50 % lymphoblasts. Immunostaining reveals cells positive TdT. He is staed on chemotherapy. Few days later his condition deteriorated. The doctor on duty is suspecting that child may have developed tumor lysis syndrome. Which of the following electrolyte abnormality is not seen in the above condition?