My friend's blood report says that the blood urea and creatinine are 68 and 13 resp. which was 109 and 15 earlier.do you consider it as an improvemnt?

Depends: Normal serum creatinine ranges from 0.8- 1.5 in many labs, however one should see the normal range in their lab report. If the creatinine doubles- eg 1 to 2, it implies 50% kidney function loss..Creatinine above 4' implies advanced kidney disease. First one must find out if this is acute kidney injury or chronic kidney disease. If it is acute, this may represent recovery. Must seek medical advice.