Hello all. My son just had his first dose of IVIG last week. His platelets went from under 2,000 to almost 675,000. My pediatrician has us scheduled with a pediatric hematologist in a month. He said that if I noticed anything unusual to give him a call. They wanted to be sure his platelets didn't continue to go up. He says my son's levels are safe so I am not that worried but I wanted to see how many of you have dealt with such drastic changes in platelet counts. And also does anyone know how high is too high for a platelet count for a 5 year old boy?