How often do you follow ferritin and organ iron-deposition in a patient who has known hereditary hemochromatosis, but no current evidence of iron overload?

Once diagnosis is made, I stress blood donation or less optimally, therapeutic phlebotomy. If donation every 56 days until ferritin <100 and TSAT <30. This assumes asymptomatic without LFT abnormality. Thereafter the intervals can be adjusted to keep parameters in the desired range. I never follow o...