Pathological Features and Grading of Diabetic Nephropathy: Correlation with Clinical Parameters and Renal Outcomes
1Babar Shahzad, 2Umar Tipu, 3Mansoor Musa, 4Dr Muhammad ishaq, 5Isma Abbas, 6Dr Yasmin Wahid
Submission: 11 January 2026 | Acceptance: 28 January 2026 | Publication: 03 March 2026
1UHS, Lahore
2PIMS Islamabad
3UHS Lahore
4Consultant nephrologist DHQ hospital Rajanpur
5PIMS Islamabad
6Bashir Dental college, Islamabad
Background: Diabetic nephropathy (DN) is considered one of the most common causes of end-stage renal disease (ESRD) globally. Histopathological grading of DN is invaluable both for understanding the severity of the disease and disease prognosis. Knowledge of the association of pathologic findings, clinical variables, and renal outcome is crucial for optimal patient management.
Objective: To assess pathological grade of diabetic nephropathy and its pathology basis by means of clinicopathological correlation.
Methods: The study was carried out at Pakistan Institute of Medical Sciences (PIMS), Islamabad, Pakistan from May 2024 to April 2025. One hundred and ten patients with histologically confirmed diabetic nephropathy were enrolled. Glomerular, tubulointerstitial, and vascular involvements were examined in renal biopsy samples, and severity of lesions was graded according to standardized classification criteria. Clinical profile such as sex, age, duration of diabetes, glycemic control (HbA1c), proteinuria, serum creatinine and eGFR was noted. A secondary analysis examined kidney outcomes, including progression to ESRD, at follow-up.
Results: Most of the patients (64.5%) have advanced histological grades (Class III and Class IV) of diabetic nephropathy. Grades 4-5 were predictably associated with duration of diabetes (p<0.01), poor glycemic control (average HbA1c ≥9%, p=0.03), level of proteinuria (p<0.01), and eGFR (p<0.01). Tubulointerstitial fibrosis and arteriolar hyalinosis were significantly associated with poor renal outcomes. Among the same sample, 38.2% progressed to ESRD during follow-up, whereas a significantly higher percentage of those with advanced pathological grades did so (p<0.001).
Conclusion: The results showed high correlation between histopathological severity of DN and clinical parameters, especially glycemic control, disease duration, and renal parameters. Advanced histological grading was associated with poor renal outcomes and for prompt intervention in case of diabetes.
Keywords: Diabetic nephropathy, histopathological grading, renal biopsy, clinical correlation, proteinuria, end-stage renal disease, glycemic control, renal outcomes.