The best replacement for serum iron is ferritin.

The best alternatives to serum iron are rated as following:
★★★★★  ferritin
★★  serum ferritin
  tibc

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Speaking about serum iron, one probably shouldn't forget about normal hemoglobin.

Other search terms related to serum iron and their ratings are:
★★★★★ normal hemoglobin
★★★★★ normal ferritin
★★★★ low ferritin
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