Yeah the blood tests are the pricey bit with Hyper-T, to start with its another blood test after about a month, then regularly thereafter to make sure the level of treatment is right, as the tyroid levels can drop too low, and therefore need to stabilise. AFter that its every 3-6 months or so, Max's were more regular at 3 months as we were contstantly testing his kidneys too as the two hand in hand were harder to deal with.