Hi I wanted to make a separate post on this to find out whether anyone else has experienced this phenomena, and whether they know what might be going on.
I have had 2 blood tests from NHS and 2 from Medichecks in fairly quick succession without any ferritin supplementation and the 2 NHS ones are low, and the 2 Medichecks ones were high.
28 July NHS: Serum ferritin level 18 ng/mL [15.0 - 300.0]
6 August Medichecks: ferritin level 58.8 ug/L [13-150]
11 August Medichecks: ferritin level 64.6 ug/L [13-150]
9 Sept NHS: Serum ferritin level 23 ng/mL [15.0 - 300.0]
I had blood panels done at same time as the Medichecks tests and also FBC done via NHS. Results of these can be seen in my other posts: