Many kidney biopsies are taken just because we have the technology to do so, without really understanding the profound limitations of tru cut biopsies in establishing prognosis. Sequential clinical chemistry and urinalysis will usually tell you all you need to know to establish therapy and prognosis. My advice: consider very carefully what exact piece of information you would like to learn, and then contact your pathologist to see if kidney biopsy has a reasonable chance of providing that information!