Good luck! I know how that goes, Lucy just had her blood work done for her spay in october but it came back showing she has low protein levels, so I took her in again and one of her levels is raised but not where the vet would like it. So i'm going to change her diet and take her back in about a month for the blood tests again and then have her spayed.
Just listen to your vet and I'm sure everything will be okay