very variable - the reason why you cant find a sensible account for normal levels of iron is that the smart guys in the game ...... can't agree.
that is because serum levels reflects the body content badly
and a modern equivalent might be - to measure the depth of the River Parrett in Zumerzet and then use it to estimate the amount of standing water in the somerset levels.
Peter P - serum iron is indeed fairly unreliable and can vary at different times of day - it's just a snapshot in a moment of time - but serum ferritin levels (see Buenchico's link above) give a good correlation with the body's iron stores in most cases.
I presume arwyn is talking about serum ferritin levels.
Slanley sorry I've no idea, G.P's words were "arwyn you are quite severely deficient in iron".
I don't know why (maybe to sound clever ha ha) but I asked "what is the number".