The best replacement for cpk is ppk.

The best alternatives to cpk are rated as following:
★★★★★  ppk
★★★★  ck
★★★  ppm
★★★  sigma
★★  cp
★★  troponin
★  ppk capability
★  cpm
★  cmk
★  aql
★  process yield
  aldolase
  ppk six sigma
  z score
  dpmo
  ppk calculation
  sigma level
  cpu
  creatinine phosphokinase
  ppk minitab
  z values
  defect rate
  dppm

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Speaking about cpk, one probably shouldn't forget about ckmb.

Other search terms related to cpk and their ratings are:
★★★★★ ckmb
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