Hi, I had a blood test come back with a low GFR (48) and my creatinine was 1.7. This test was taken yesterday. Before that, I had the same test on December 3rd, which yielded different results. The December 3rd results showed my GFR at 89, and my creatinine at 1.0. Just trying to figure out what is going on, and if medication and/or hydration can influence these results. I'm 28 years old & a Caucasian male.