i am suffering from ulcerative colitis.i am taking mesacol from 8 months.the disease is in mild stage, only rectum is involved,.blood with stool seen only 2 times in the starting (8 months before).after that no blood is seen.few days ago my platelet count is 78000, RBC,WBC,Hb,MCH,MCV,are within normal range.what is the reason of such a low platelet count?