The best replacement for pao2 is sao2.

The best alternatives to pao2 are rated as following:
★★★★★  sao2
★★★★★  pao2
★★★★  po2
★★  paco2
★★  fio2
★  spo2
★  o2 sat
★  pulse ox
★  cao2
  saturation
  oxygen saturation
  o2 saturation
  svo2
  sa02

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