The best replacement for spo2 is sao2.

The best alternatives to spo2 are rated as following:
★★★★★  sao2
★★★  po2
★★★  pao2
★★★  svo2
★★  so2
★★  fio2
★  sto2
  pa02
  spo2
  etco2
  sa02

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spo2
sao2
po2