What is a dangerously low blood oxygen level?

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  1. #level
  2. #individual
  3. #depending
  4. #between
  5. #require
  6. #blood
  7. #oxygen
  8. #mercury
  9. #below
  10. #levels
  11. #considered
  12. #normal
  13. #millimeters
  14. #supplementation
  15. #varies
  16. #decision
  17. #doctor