# ferritin

A protein that stores iron, measured with a blood test. The level shows roughly how much iron the body has in reserve.

## Where it comes up

- [Why do my legs feel restless at night?](https://nitez.com/restless-legs)
- [Why is it so hard to sleep while pregnant?](https://nitez.com/pregnancy-and-sleep)

https://nitez.com/words/ferritin