The best replacement for normal hemoglobin is sickle cell.

The best alternatives to normal hemoglobin are rated as following:

★★★★★	sickle cell
★★★	sickle hemoglobin
★	sickle cell hemoglobin

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Speaking about normal hemoglobin, one probably shouldn't forget about low ferritin.

Other search terms related to normal hemoglobin and their ratings are:

★★★★★	low ferritin
★★★★	low hematocrit
★★★	low iron
★★★	low mcv
★	low ferritin level
	low serum iron
	low serum ferritin

You have in mind a companion for normal hemoglobin and it is not yet here? Propose!

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normal hemoglobin

sickle cell

sickle hemoglobin