Creatinine level high. Is low at 8.

My father is 67 years old and has been suffering from diabeties since the past 25 years and it has now affected his kidneys. In October 2016 his creatinine was 2.92 and we were informed that he is suffering from CKD. Later in December 2016 his creatinine was reported to be 3.0 . In january 2017 creatinine arose to 4.77 and he had lost his appettie and had become very inactive for which he had to be admitted to the hospital. On 25th of Jan creatinine was recorded to be at 6.7 and within two days on the 27th of Jan it was reported to be 7.7 with all medications in place as listed below. His diabeties is between 130-200 between fasting and post lunch. We were informed that diabeties is within control. His BP is reported at an average of 137 to 140 everyday. ECG and 2Decho look good as informed. His potassium is currently 4.2, Haemoglobin is low at 8.