. I won't use names or log in names so as to keep it private.
Researchers have found that ferritin needs to be at least 50 for those with RLS. The minimum/maximum levels are really determined sort of arbitrarily, to my surprise, so the researchers think maybe everyone's level should be higher. But, that is neither here, nor there, as they say. Ferritin is the measure of the iron stored in your body. You can have great levels of iron in your blood (hemoglobin) but have very low ferritin.
The ranges for lab test vary by lab. Each sets its own ranges. Some have a low of 10, others 15, or 20 or even 25 for ferritin. It's not so much important what the lab says or where yours is, simply if it is below 50, it may help to take iron. Your doctor may not know this, so you may have to educate them or they won't test you if your ferritin is within the lab's range.
When you take iron, always get new blood tests every 3-4 months. While usually we don't get too much iron stored, it can happen and that is actually much worse than not having enough. Similarly, don't take iron unless you've had a test and know your ferritin level. People can have very high levels of ferritin and still have RLS.
To take it, Dr Buchfurer recommends taking 325 mg of ferrous sulfate 3 times a day, on an empty stomach, and with a vitamin C tablet or product (like wash it down with orange juice). You may find it bothers your stomach and you have to take it with food. It will bother your intestines - dark, tarry stools, bloating, gas, and constipation are all likely. The best you can do is make sure you get lots of water and fiber, and walk if you can--it is good for improving the speed at which stool moves through you.
There are different types of iron you can take. Some are supposed to be less easier on you. I just can't remember what the names are (pretty foggy today). If someone else does, please post!
Anyway, hope this helps.