I'm a little confused with this iron issue again. Sorry... Trying to figure something out.

Can someone explain to me again the difference between ferritin levels and serum iron levels...

If a doctor was testing for anaemia would they test both ferritin levels and serum iron levels?

and

I thought there was a difference between having an iron deficiency/anaemia and having problems with the actual transport system in the body which usually sends our stored iron to specific areas of the brain?

Stored iron is ferritin... right?