I just had routine blood work done and my gfr was 59. I am 30 years old, 5'9" and 130lbs. I have low blood pressure, usually 120/65. I am very skinny, which I read somewhere that it can cause lower gfr readings. The week leading up to my my blood work I had been taking 2,000-6,000 mg of vitamin c due to a cold. I also reflected on my diet in the time leading up to my blood tests. It was very poor, high salt intake and I had been drinking some sodas even though normally I don't. Usually I just drink water all day and coffee in the morning.
My doctor said I need to come back for another blood test in a week. My question is could my diet and lack of drinking of water have affected my gfr reading for the last blood test? I am very worried, as I don't have a history of kidney disease in my family. I also don't have blood in my urine or any other symptoms of kidney disease. Any insight from someone who knows more about this than me would be greatly appreciated!