Where I am they give you iron tablets if you are are 10.5 or under. I already have iron in the (really expensive!) supplement I was taking and I was only 10.7. Took the iron for a few weeks anyway and it went up nicely.
I generally go by 12 as a good number. 11 isn't dangerous, but it could lead to slight dizziness, or if you get cut, extra bleeding...which, in turn, lowers your levels more. If the dr was really concerned, he wouldn't be saying 'eh, maybe eat some spinach or take a pill or something,' you'd be on a heavy suppliment (go black poo!) or he'd be telling you to go eat liver NOW or he'd admit you for an iv or something.
Even if you eat healthy, you have a little person living inside you and sucking out all your nutrients, so you could get a little low on all your levels. Iron absorbtion can also be affected by other food, activity level, sunlight, mood, etc. Its a touchy thing.
I wouldn't panic by any means, but I'd go to subway and get spinach on your sandwich or something.
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