<s>[INST] I had a kidney transplant on Aug 12; my son gave me one of his kidneys. My creatinine went from .89 o 1.07 in just 5 days. I go for labs every Mon and Thurs, so I just had more labs done today. I am anxious to see what my latest creatinine is from today. Is there a reason for concern at this point? I do not know what my GFR is; for whatever reason, they don t test for that. [/INST] Hi, Thanks for writing in. A creatinine level from 0.89 to 1.07 is acceptable after 5 days following renal transplant surgery. This is a minimal elevation and within normal range. As long the serum creatinine is in the normal range of 1.4 it does not cause any worries. This indicates that your kidney is able to filter out the toxins in expected amount and the blood is getting filtered. The GFR is calculated using a formula, and you might contact your lab and doctor to exactly know the GFR right now. Please maintain a chart of the creatinine level and this will help notice any abnormal value and guide you through detailed investigation. Please do not worry. </s>