JOURNAL ARTICLE
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Percutaneous renal graft biopsy: a clinical, laboratory and pathological analysis.

CONTEXT: Renal allograft biopsies have been used as a good method for monitoring the evolution of kidney transplants for at least 20 years. Histological analysis permits differential diagnosis of the causes of allograft dysfunction to be made.

OBJECTIVES: To correlate the data of urinalysis and serum creatinine with histological diagnosis of renal graft in a group of renal transplant patients.

DESIGN: Accuracy study, retrospective analysis.

SETTING: A university terciary referral center.

SAMPLE: 339 percutaneous allograft biopsies obtained from 153 patients. Blood and urine samples were obtained before the graft biopsy.

MAIN MEASUREMENTS: Laboratory evaluation and hystological analysis (light microscopy, immunofluorescent electronic microscopy).

RESULTS: Most of the biopsies (58.9%) were performed during the first month post-transplant. An increase in serum creatinine was associated with acute tubular and/or cortical necrosis. Proteinuria and normal serum creatinine were associated with glomerular lesions. Non-nephrotic range proteinuria and an increase in serum creatinine were associated with chronic rejection.

CONCLUSION: Evaluation of serum creatinine and urinalysis can be useful in suggesting the histological graft diagnosis.

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