Hello and welcome to HCM. As an Urologist, i can fully understand your concern. What you need to know is, creatinine and urea, are wastes products of the body, that normally get filtered out of the kidney, and are flushed out in urine. Normal urea is upto 40, and normal creatinine is upto 1.2. In your dads case, both are significantly above normal, causing the vomitting. On the scan, the kidney changes are noted as parenchymal kidney disease. Hope your doubt is cleared. You may send the scan report in my name, for expert opinion.