How To Prepare continued...
You will have blood tests done before the kidney biopsy to see whether you have any bleeding problems or blood clotting disorders. You may also have an ultrasound test or CT scan of the kidney to show the best place in your kidney to put the biopsy needle.
You will be asked to sign a consent form that says you understand the risks of the test and agree to have it done.
Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results will mean. To help you understand the importance of this test, fill out the medical test information form(What is a PDF document?).
How It Is Done
A kidney biopsy is done by a urologist, nephrologist, or a radiologist in a clinic or a hospital. A kidney biopsy is often done by a radiologist using ultrasound, fluoroscopy, a CT scan, or magnetic resonance imaging (MRI) to help guide the biopsy needle.
You will need to take off all or most of your clothes. You will wear a gown. Before the biopsy, you may be given a sedative through an intravenous (IV) line in a vein in your arm. The sedative will help you relax and lie still during the biopsy.
During the test
You will be asked to lie on an examination table. A sandbag, a firm pillow, or a rolled towel will be placed under your body to support your belly. It is very important that you follow your doctor's directions about breathing, holding your breath, and lying still while the biopsy is being done.
Your doctor will examine your back and may mark the biopsy site by making a slight dent in your skin with a pencil or tool. The biopsy may be done on either the right or the left kidney. The site will be cleaned with a special soap. Your doctor then gives you local anesthetic to numb the area where the biopsy needle will be inserted.
Your doctor puts the biopsy needle through the skin while looking at your kidney with ultrasound or another imaging technique. You will be asked to hold your breath and stay very still while the needle is put into the kidney.