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Kidney Biopsy : Indications, Preparation and Procedure
Pace Hospitals
Kidney biopsy is also called renal biopsy is a procedure during which a small piece of kidney tissue is removed and examined under microscope with a variety of stains to identify the underlying disease which is affecting the kidney function. The procedure of kidney biopsy is generally safe and can provide valuable information regarding the underlying kidney disease and helps in treatment.
Indications for kidney biopsy
Kidney biopsy is recommended in people with kidney disease. Based on the results of urine and blood tests nephrologist will advice the kidney biopsy. The most common reasons for kidney biopsy are as follows. More than one reason may be present in a given patient.
- Blood in the urine (called haematuria)
- Protein in the urine (called proteinuria)
- Problems with kidney function (if the kidneys function declines slowly or suddenly and the cause is not clear)
Uses of kidney biopsy
- Diagnosing a kidney problem which cannot be identified by any other way
- Helps is developing treatment plan
- Determines the extent of kidney damage
- Can tell us how well the treatment is working
- Can tell us if any treatment is going to work or not based on the damage already occurred
Preparation for kidney biopsy
If there is an indication to do a kidney biopsy following checks are done to prevent bleeding complications.
- Adequate blood pressure control in patients who are already hypertensive preferably below 140/90mmHg
- Blood tests are done to check if the patient has adequate haemoglobin and clotting capacity
- Tests done are- complete blood count, PT-INR, APTT, Bleeding and clotting time
- Urine tests are done to rule out any infection
- Ultrasound kidneys to see if the kidneys are in normal position and size of kidneys are checked
- Medications are reviewed to see if the patient is on blood thinners like Aspirin, clopidogrel, warfarin, rivaroxaban, dabigatran, heparin etc
- Blood thinners like aspirin and clopidogrel are stopped 7 days before procedure
Procedure for kidney biopsy
During the procedure patient will lie on his abdomen with back facing the roof and will be awake. For patients who are renal transplant recipient’s biopsy is done with patient lying on back. Kidney biopsy procedure included following steps
- Using an ultrasound machine probe, size of the kidneys and position of the kidneys are assessed first and then a site is identified to insert the kidney biopsy needle
- Skin over the back where the site of entry is marked is cleaned with antiseptic
- A local anaesthetic medication is injected with a syringe with needle at the site of entry to numb the area
- Using the ultrasound probe as a guide, a biopsy needle (a spring-loaded instrument) is inserted and sample of kidney is collected
- Patient is asked to hold the breath while collecting the sample and patient hears a pop sound or sharp clicking sound or feel some pressure
- Biopsy needle maybe inserted few times to get adequate sample
- Once the procedure is completed a bandage is placed over the biopsy site
Post procedure care
Patient is admitted in hospital over night after the biopsy to monitor for complications. Immediately after the procedure biopsy site is compressed and patient lies on his back. His pulse rate and blood pressure are monitored every 30 minutes for 6 hours. Patient is given transparent containers to collect urine each time he passes so that if any bleeding happens will be identified. After 6 hours patient can move in bed to sides but strict bed rest is advised overnight. Next day morning his blood pressure and pulse rate is checked and if there is no complication (like blood in urine) patient is discharged.
Contraindications of kidney biopsy
Kidney biopsy is avoided when the risk to patient is more than the benefit of procuring the kidney tissue.The following are the contraindications for kidney biopsy
- Skin infection over site of needle insertion
- Infection of kidney (pyelonephritis)
- Uncontrolled hypertension (systolic BP > 140 mmHg)
- Small hyperechoic kidneys (suggestive of advanced irreversible chronic kidney disease)
- Patients with increased bleeding risk
- Low platelet counts, elevated INR
- On blood thinners and anti-blood clotting medications (need to be stopped before procedure)
- Horse shoe kidney
- Multiple cysts in kidneys
- Hydronephrosis (obstruction to urine outflow from kidney)
Possible complications of kidney biopsy
Serious complications are not common after kidney biopsy but can rarely happen. Less serious complications are common like pain, bleeding and development of an abnormal connection between two blood vessels (a fistula).
Bleeding
- Bleeding is the most common complication of renal biopsy.
- Many people may notice blood in their urine after biopsy which resolves spontaneously
- Some times blood may clot in urinary bladder and requires Foleys catheter insertion to clear the clot
- Severe bleeding into the kidney or urine requiring blood transfusion is uncommon
- Very rarely, it may become life threatening and possibly require a procedure or surgery to stop the bleeding.
Pain
- Pain can occur after a renal biopsy
- Pain generally responds to pain killers and resolves
Aretriovenous fistula
- The biopsy needle can rarely injure the walls of a nearby artery and vein, and this can lead to the development of a fistula (a connection between the two blood vessels).
- These are benign and generally intervened only when they cause bleeding which is persistent, resistant hypertension and heart failure or kidney dysfunction
Dr. A Kishore Kumar
MD, DM (Nephrology) (AIIMS, Delhi)
Consultant Nephrologist and Renal Transplant Physician
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