Quick answer
Transparietal kidney biopsy takes a fragment of kidney tissue, under ultrasound guidance, from a native or transplanted kidney. Performed as a day case, it provides a precise histological diagnosis in cases of kidney disease or graft dysfunction.
📖 What is percutaneous kidney biopsy?
Percutaneous kidney biopsy is the removal of kidney tissue under ultrasound or CT guidance, allowing the histological diagnosis of kidney diseases (glomerular and tubulo-interstitial nephropathies) and kidney tumours. It is essential before any treatment decision for a kidney mass.
Performed under local anaesthesia as a day case by the Interventional Radiology department of Cochin Hospital AP-HP, image-guided kidney biopsy is accurate and safe, with a serious complication rate below 0.5%.
⚡ Kidney biopsy at a glance: key figures
Percutaneous kidney biopsy takes a sample of kidney tissue, under ultrasound guidance, to diagnose a kidney disease or characterise a tumour, without surgery.
| Criterion | Data |
|---|---|
| Anaesthesia | Local: well-tolerated procedure; sedation or general anaesthesia if potentially painful |
| Guidance | Ultrasound, sometimes CT |
| Complications | Rare (bleeding) |
| Monitoring | A few hours of observation after the procedure |
| Coverage | Reimbursed by French health insurance (Assurance Maladie) at Cochin AP-HP: no extra fees |
Data validated by the team of Pr Anthony Dohan, Department of Interventional Radiology, Cochin Hospital AP-HP, Université Paris Cité.
✅ What benefits can be expected?
Image-guided transparietal kidney biopsy (PRB) consists of taking one or more fragments of renal cortex with a fine needle under ultrasound or CT guidance. The expected benefits are:
- Histological diagnosis that is essential for diagnosing medical kidney diseases and characterising kidney masses
- Serious complication rate below 0.5%
- Performed under local anaesthesia as a day case
- Allows molecular diagnosis of kidney tumours with a view to targeted therapies
- Suitable for native and transplanted kidneys alike
📋 Indications
- Diagnosis of glomerular, tubulo-interstitial and vascular nephropathies
- Unexplained nephrotic or nephritic syndrome
- Acute or chronic kidney failure of undetermined cause
- Follow-up of the transplanted kidney (acute rejection, immunosuppressant toxicity)
- Characterisation of an indeterminate kidney mass (before ablation or surgery)
- Molecular diagnosis of kidney tumours (targeted therapies)
🔧 Procedure
Preliminary work-up: coagulation, blood typing, creatinine. Anticoagulants/antiplatelet agents stopped according to protocol.
Positioning prone (native kidney) or supine (kidney transplanted in the iliac fossa). Ultrasound identification of the lower pole of the kidney.
Local anaesthesia at the puncture site. The procedure lasts 20 to 30 minutes.
Sampling: 2 cores of renal cortex with an automatic needle (16-18G), during an inspiratory breath-hold.
Monitoring for 6 to 24 hours: pulse, blood pressure, macroscopic haematuria. Return home the same day or the next day depending on the case.
⚠️ What are the possible complications?
| Complication | Description | Frequency |
|---|---|---|
| Macroscopic haematuria | Transient in the vast majority of cases | 10–20 % |
| Perirenal haematoma | Most often asymptomatic, visible on CT | Common |
| Arteriovenous fistula | Treated by embolization if symptomatic | Rare |
| Bleeding requiring transfusion | Exceptional | < 1 % |
📐 What are the limitations of this procedure?
In rare cases the sample may be insufficient for a complete analysis, requiring a repeat biopsy. For very small kidney masses, characterisation may be more difficult.
🔀 What other diagnostic approaches are possible?
👁️ Imaging surveillance
For small, low-risk kidney masses, ultrasound or CT surveillance may be offered before biopsy.
🏥 Upfront surgery
For certain highly suspicious masses, a partial or total nephrectomy may be decided without a prior biopsy.
❔ What happens if I finally decline the biopsy?
You remain entirely free to decide. Your doctor will discuss the alternatives with you: imaging surveillance, or a treatment decision without histological confirmation depending on the context.
📄 Patient sheet to download
✅ Procedure covered by French health insurance (Assurance Maladie) · No extra fees · Cochin Hospital AP-HP
❓ Frequently asked questions
✓ Why this page is trustworthy
Written by the Interventional Radiology team at Cochin Hospital AP-HP, Université Paris Cité. Medically reviewed by an interventional radiologist of the department. Last updated: July 2026.