Ferritin is a protein which can store about 4500 iron ions in a hollow shell made of 24 identical subunits. Inside the ferritin shell, iron ions form crystallites together with phosphate and hydroxide ions.

GoldBamboo

... Why get tested?
To learn about your body’s ability to store iron for later use

When to get tested?
When your doctor suspects you may not have enough iron or too much iron in your system

Sample required?
A blood sample drawn from a vein in your arm
...
Lab Tests Online - more...

[[Image: ...
Wikipedia - [full article]

Resources