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Getting ready for a kidney biopsy: why, getting ready, how it is done, and after
For anyone with a kidney biopsy coming up, including on a transplanted kidney. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK, part of the NIH) says a kidney biopsy takes one or more tiny pieces of tissue from your kidney, so a pathologist can look for signs of damage or disease under a microscope. This page passes on, by name, what NIDDK says: why it is done and what it can show; getting ready, with your blood pressure and your medicines; how the needle biopsy is done; the other ways; and recovery, the results, the risks, and the signs that mean seek medical help right away. It builds the words to say and the questions to ask, and prints a card for the fridge.
Right now
- Trouble breathing, chest pain, or fainting? Call 911 (ours).
- After a kidney biopsy: you can’t urinate or it burns, urine that is dark red, brown, or has clots, worsening pain, redness, swelling or drainage at the biopsy site, a fever, or you feel faint or dizzy? NIDDK says seek medical help right away. If you cannot pee at all and cannot reach your team, go to the emergency room (ours).
- Having a biopsy and you take aspirin, an NSAID pain reliever, a blood thinner, or any daily medicine? NIDDK says review them all with your health care professional. Do not stop or change a prescribed medicine on your own (ours).
- Scared of what the results may say, or thinking of ending your life? Call or text 988, any hour (ours).
More help
- The kidneys and bladder, on this site: Kidney disease · Blood in the urine · High blood pressure · Getting ready for a cystoscopy or ureteroscopy · Kidneys, bladder and urine: find the right page.
- If the word is cancer: When the doctor says cancer.
- Getting ready: My medicines list · Get ready for your appointment · Rides to care.
- Care and costs: When you need a doctor and can’t pay · Medical bills.
- In a crisis: Help right now (988, 911). All our free tools.
Another test coming up, or not sure this is the right page? The guides on this site for a colonoscopy, an endoscopy, a GI series, ERCP, a biopsy, a cystoscopy, urodynamic tests, urinary tract imaging, prostate tests, an A1C and thyroid tests, on one list.
Kidneys, bladder or urine, and not sure this is the right page? The pages on this site for bladder infections, kidney stones, blood in the urine, bladder pain, bladder leaks, the prostate, kidney disease and bedwetting, on one list.
Other guides on this site that go with this page
Free to read. We chose these ourselves; no professional did. Each guide was written with AI and has not been reviewed by a professional. They are general information, not advice.
- Lupus nephritis: when lupus reaches the kidneys, the signs, the tests, the biopsy, and the treatment: lupus nephritis, kidney disease caused by lupus: what it is, who gets it, the signs (foamy urine, swelling, high blood pressure), what it can lead to, the urine and blood tests, the kidney biopsy, and the medicines, blood pressure and food.
- IgA nephropathy (Berger’s disease): the signs, the biopsy, and the treatment: IgA nephropathy, Berger’s disease (pink, cola-colored or foamy urine, swelling, or a kidney biopsy that showed it): what it is, who is more likely to have it, the signs and what it can lead to, the tests and the biopsy, the kinds of medicine and less salt, and food, family and research.
- Nephrotic syndrome: in adults and in children: nephrotic syndrome in adults and in children (swelling, foamy urine, protein in the urine): what causes it, the signs and what it can lead to, the urine and blood tests, the treatment, and steroids and relapses in children.
- Glomerular disease: the signs, the causes, the tests, and the treatment: glomerular disease (FSGS, lupus nephritis, membranous nephropathy, minimal change disease and others; foamy or cola-colored urine, swelling, or a kidney biopsy that showed it): what it is, the causes and who gets it, the signs and what it can lead to, the tests and the biopsy, the kinds of medicine and kidney failure, and food, family and research.
This page and its wording were written with AI (Claude) for Scarlet Beast (our AI policy). No doctor or nurse has reviewed it. The facts were read on October 17, 2026 on NIDDK’s Kidney Biopsy page (NIH) and its Spanish version, both last reviewed in March 2022 and saying the same things; the cards also point to NIDDK’s Chronic Kidney Disease Tests & Diagnosis, Hematuria (Blood in the Urine) and Kidney Transplant pages. The numbers (about an hour; arriving 90 minutes to 2 hours before; pink or slightly cloudy urine for up to 24 to 48 hours; 2 weeks before strenuous activities; a preliminary report within 24 hours in urgent cases) are NIDDK’s. Ours: 911 for trouble breathing, chest pain, or fainting; the emergency room if you cannot pee at all and cannot reach your team; never stopping or changing a prescribed medicine on your own; asking which kind of biopsy and why; asking whether to plan to stay overnight; asking when the follow-up visit is; that it is fine to ask them to tell you each step; someone to check on you the first night; the card; 988 when it is too much; health centers when money is tight; and the order of the steps. What we left out: medicine brands, doses, NIDDK’s four journal references, and clinical pages for providers. This page saves nothing and loads no trackers.