The best replacement for blood glucose is plasma glucose.

The best alternatives to blood glucose are rated as following:
★★★★★  plasma glucose
★★★★  a1c
★★★★  blood sugar
★★★  serum glucose
★★★  urine glucose
★★  hba1c
★  muscle glycogen
★  whole blood glucose
★  venous blood glucose
★  hemoglobin a1c
★  plasma
  random blood glucose
  plasma blood glucose
  capillary blood glucose
  venous glucose
  mean plasma glucose
  venous

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Speaking about blood glucose, one probably shouldn't forget about hba1c.

Other search terms related to blood glucose and their ratings are:
★★★★★ hba1c
★★★ a1c
★★ hemoglobin a1c
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Google Trends

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blood glucose
plasma glucose
a1c