my father is having dibetes and high blood pressure since last 6 years. His createnine level in December 10 was 1.6, however in the same month he was hospitalized coz of breathlessness & hypertension . since then his createnine level shooted upto 2.2 and remained progressively increasing and sometimes decrease (some of his cretenine values for january 11 & feb 11 are to 3.1, 2.8, 4.8, 3.9, 4.2 and his latest reported value is 3.3 mg/dl. his urea level is also high (100) kindly suggest whether he require dialysis right now and at what level dialysis is recommended. what is the reason of such fluctuation in his createnine level in such short span of time.