My blood test in July showed ferritin 340; yesterday it came back at 650, and my first transferrin saturation reading was 44%. (CRP was 1), so its unlikely due to inflamation. I don't have any auto-immune conditions. But the problem is the NHS lab in my area will reject any request for the gene test if the transferrin saturation is lower than 50%. My only symptoms are tiredness and heavy limbs no shortness of breathe.