The best replacement for anion gap is non anion gap.

The best alternatives to anion gap are rated as following:
★★★★★  non anion gap
★★★★  base excess
★  osmolar gap

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Speaking about anion gap, one probably shouldn't forget about dka.

Other search terms related to anion gap and their ratings are:
★★★★★ dka
★★★★ metabolic acidosis
★★ metabolic alkalosis
★★ osmolar gap
★ acidosis
high co2
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anion gap
non anion gap
base excess