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
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01
Why do my legs feel restless at night?
Restless legs at night: what the creeping urge to move is, why it comes in the evening, how iron and some medicines feed it and what helps.
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02
Why is it so hard to sleep while pregnant?
Why sleep gets hard in each trimester, from nausea and heartburn to needing to pee, what the side-sleeping advice really says, and what helps.