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Background and Aims Percutaneous renal biopsy is the mainstay of renal pathological diagnosis. Not only does it secure an accurate diagnosis, but also lends itself to guiding the prognosis of a myriad of renal disorders. An important diagnostic modality for nephrologists, they have contributed greatly to the field of nephrology, both in terms of the classification of diseases and assisting in understanding their pathogenesis. Adequacy of the tissue samples of at least ten to fifteen glomeruli is generally preferred. The aim of our retrospective study was to review the renal biopsies done in one large UK renal centre, namely Salford Royal Foundation Trust, over the last twenty years. This Trust covers a catchment area that serves approximately 1.5 million people. Method A list of all renal biopsies performed at Salford Royal Foundation Trust between January 2000 to January 2020 was generated by our pathology department. Following this, each individual biopsy report was reviewed. In addition to this, certain information was collated from individual patient records; namely patient demographics, the indication for biopsy, tissue type (native or transplant), histological diagnosis and outcomes. Our centre has an excellent electronic patient record (EPR). This enabled us to analyse full clinical data retrospectively for each case. Results Between January 2000 and January 2020 a total of 3555 renal biopsies were performed at Salford Royal Foundation Trust. These biopsies were performed solely by nephrology specialists and supervised trainees, under ultrasound guidance. 177.5 biopsies were performed on average, per year, ranging between 140 – 203. 90% of biopsies were performed on native kidneys, with 10% being performed on transplanted kidneys. 10% of biopsies had normal histology morphologically when reviewed by light microscopy. There diagnoses of these included entities minimal change disease and thin basement membrane disease most commonly. IgA nephropathy was the most common glomerular pathology identified, in keeping with the wealth of published literature. There were over 525 biopsies done confirming IgAN as the primary pathology. 7% of biopsies had a crescentic glomerular pathology when examined histologically. The main causes included crescentic IgA nephropathy and anca-associated vasculitis. Conclusion Kidney biopsies have long been regarded as safe, minimally invasive procedures are of paramount importance to our diagnostic armamentarium. Our data echoes that of already published pathology series, IgAN being the most common glomerular pathology in our series. We further plan to analyse the various conditions and their outcomes in further detail.

P0102A REVIEW OF RENAL BIOPSIES IN A LARGE UK RENAL CENTRE- A 20 YEAR EXPERIENCE