newbie question what feritin test is the right one? Which B12 test?

[Guest guest]

I'm going to get my test. Is it Serum Ferritin? Is that all that I need for

that? Do I need any other iron tests? One on the econolab site says Iron and

TIBC with % of iron saturation. Is that needed?

And I want to test B12. There is one that says B12, and another says B12 and

folates. Which would you do?

Thanks