I agree with the above with carboplatin. If toxicities get that severe, wbc, neuropathy, kidney function, hearing, they could even stop chemo altogether, and give radiation alone. When the kidney function is low, the GFR or eGFR on the blood test is low, and believe above 90 is normal kidney function. The creatinine would be high on the blood test. Normal range for creatine is between 0.7-1.33, if you're interested in looking. Good luck.