How often should you repeat iron testing in patients with hemochromatosis, not on phlebotomy?

I can't think of a reason in the world to not do phlebotomy either therapeutically or through donation until TSAT is around 30 and ferritin is <100. I try to keep my hemochromatosis patients low, not high normal because the propensity for high TSATs makes subclinical deposition easy. I don't think t...