A strong sign of kidney disease would be protein (creatine?) in urine.
Perhaps combined with the absence of infection (as infection might weaken the kidney leading to incidental protein in urine), and infection is usually readily cured so would not be seen as chronic kidney disease.
I could google up the science on it, but I'm reasonably confident that low potassium and low carbon dioxide have absolutely nothing whatsoever to do with kidneys.
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