No other condition that I am aware of. My primary doctor suggested it based on my egfr numbers. My primary doctor said I had stage 3 kidney disease. My Nephrologist told me my primary doctor don’t know what they were talking about. My Nephrologist did their our series of tests on me, 24 hour urine sample, etc. All my tests came back fine. I have really good insurance. I don’t need a referral to see a specialist. I got in within 4 weeks of my appointment.