Pulled a high creatinine level (1.6) but good Cystatin-C (.8)

I don't take days off from lifting before getting labs. I just get them the next day. Usually I pull about a 1.2 Creatinine and a .6 to .9 Cystatin-C.

This time around:

eGFR using my Creatinine, like 56 (terrible).
eGFR Using Cystatin-C (113). And If I adjust for bodyweight, eGFR 157.

Was also using creatine this time around. But not sure if that matters.

Should I be worried?

According to which lab I go by, I'm either in kidney failure or have amazing kidneys.
 
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