My grandson, eleven yrs old has been diagnosed with IDP an immune system problem that attacks blood platelets. He received an infusion which brought the platelet count up to normal after three or four days. A week later he had a blood test to check his count and it had dropped to 27,000. He is back at the hospital receiving another infusion today. Is their any way to find out why all of a sudden his platelets dropped originally (down to 6,000) or the most recent drop to 27,000.