When kidney lesions are found on imaging, a biopsy is often the next step to understand what's going on before any major decisions — like a nephrectomy or transplant — are made. It helps doctors get a clearer picture of the tissue itself.
A kidney biopsy involves removing a small piece of kidney tissue to examine under a Show Full Answer
When kidney lesions are found on imaging, a biopsy is often the next step to understand what's going on before any major decisions — like a nephrectomy or transplant — are made. It helps doctors get a clearer picture of the tissue itself.
A kidney biopsy involves removing a small piece of kidney tissue to examine under a microscope. There are two main approaches:
- Percutaneous (needle) biopsy — A thin needle is guided through the skin using ultrasound or CT imaging. The skin is numbed first, and you may feel some pressure or a brief snapping sensation.
- Open biopsy — A small incision is made to access the kidney directly, then stitched up afterward. Before the biopsy, some important prep steps are typically required:
- Stop blood thinners and certain pain medications (like aspirin or ibuprofen)
- Avoid certain herbal supplements
- Follow fasting instructions
- Complete pre-procedure blood work, urine tests, or a physical exam
After the procedure, results usually come back within 3 to 5 days. There are some risks to be aware of, including bleeding, infection, urinary retention, or inconclusive results — but the medical team will monitor closely and guide next steps.
This biopsy information is especially valuable before a nephrectomy or transplant, as it helps the care team plan the most appropriate treatment path. Always lean on your kidney specialist team with any specific concerns.
July 16
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