Ferritin as an Assessment of Iron Status

No less than 10% of iron is in ferritin inside the cell, not inside the cell. That again, that's what was used for over 100 years. I think that's a more powerful indication. Why? Because it's a bigger pool of iron and it's constantly being recycled. If you're under 20 possibly it could be some serious issue,. You need to see someone who knows this at a deeper level like you were mentioning to really sort out the details.