First my creatinine was 170 then second time turn into 75.5 and the last time i checked up it was 83.5. How is that ? Is that a bad?

It sounds like there is some inconsistency with the laboratory.  I cannot explain the differences.  I suggest that you visit our web site and learn how the serum creatinine is used to calculate the estimated glomerular filtration rate (eGFR).  You can visit our web site at:

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