Synopsis
Decide when renal tissue can change diagnosis or treatment, prepare safely for biopsy and translate compartment-specific pathology into an integrated clinicopathological conclusion.
- Biopsy is justified when the likely information can alter treatment, prognosis, counselling or eligibility for a specialist therapy and the answer cannot be obtained safely by less invasive means.
- Common native-kidney indications include unexplained progressive impairment, nephritic or nephrotic presentations, significant proteinuria, suspected glomerular or interstitial disease and selected systemic disorders.
- The decision belongs to a renal specialist with the patient. Small kidneys, uncontrolled hypertension, bleeding disorders, a solitary kidney, obesity, frailty or inability to cooperate raise risk or reduce yield but require individual assessment rather than a memorised absolute list.
Key red flags
A rapid creatinine rise with haematuria, proteinuria, red-cell casts, hypertension and systemic vasculitic or pulmonary features suggests active crescentic disease. Urgent serology and nephrology discussion run in parallel with expedited biopsy planning.
Investigation priorities
Identify anaemia, thrombocytopenia or coagulation abnormality and prepare for haemorrhage according to procedural policy.
Management branches
A renal syndrome remains unexplained after initial blood, urine and imaging assessment.
- Construct a narrow differential from acuity, eGFR trajectory, protein loss, sediment, serology, medicines and systemic features, and state the unresolved management decision.
- Discuss with nephrology whether tissue is likely to distinguish actionable diagnoses or quantify activity and chronicity better than non-invasive tests.
Key medicines
Anticoagulant and antiplatelet peri-biopsy planDo not apply a universal interval. The renal unit sets last dose and restart from the exact agent, renal clearance, indication, thrombotic risk, bleeding risk and procedural route.
Paracetamol after uncomplicated biopsyUse the locally approved adult regimen, reduced where low body weight, liver disease, malnutrition or other paracetamol-containing products require it.