Which statement best describes the purpose of a kidney biopsy in glomerular disease?

• A. It is used to monitor kidney function in real time
• B. It is a purely therapeutic procedure
• C. It identifies specific glomerular diseases, determines prognosis, guides therapy, and assesses activity versus chronicity
• D. It has no bleeding risk

Answer: (C)

The main idea here is that a kidney biopsy provides tissue evidence to identify exactly what glomerular disease is present and to guide what to do next. By examining the glomeruli under the microscope, clinicians can see patterns of injury—such as immune deposits, crescents, or sclerosis—and correlate these with specific diseases (for example, immune-mediated GN, membranous nephropathy, IgA nephropathy, etc.).

This information lets us estimate prognosis, because the amount of chronic damage (like scarring and interstitial fibrosis) versus active inflammation helps predict how the disease might progress. It also guides therapy, since different glomerular diseases respond to different treatments (immunosuppressants, targeted therapies, or supportive care), and it shows whether there is ongoing activity that requires more aggressive treatment or if the changes are primarily chronic and less amenable to therapy.

A biopsy is not about monitoring kidney function in real time—that role belongs to lab tests and imaging—and it does carry bleeding risk, so it’s not a risk-free procedure. Overall, it provides the definitive information needed to identify the disease, gauge prognosis, tailor treatment, and assess the balance between activity and chronicity.