Renal fibrosis is a characteristic outcome of acute kidney injury and ischemia-reperfusion injury. It is a key driver in the progression of chronic kidney disease, affecting millions worldwide and leading to significant morbidity and mortality. End-stage renal failure (ESRF) due to fibrosis necessitates dialysis or kidney transplantation, negatively impacting quality of life and creating a global challenge for sourcing viable donor organs. 

Research capturing early and advanced stages of fibrosis, most pronounced in the interstitial tissue, involves sophisticated manipulation of kidneys and kidney models to dissect physiological, molecular, and cellular mechanisms. It often includes investigating the contributory pathological pathways of oxidative stress and inflammation. Techniques such as transcriptome pathway analysis, kidney histological imaging, MRI, and ultrasound are commonly used assays. 

However, there is a lack of consensus on the optimal integration of techniques and troubleshooting problematic assays, such as selecting exemplary kidney section representations and identifying optimal biomarkers of renal fibrosis. Questions remain about how multifactorial origins lead to different fibrotic outcomes, the best methods for clinical randomized control studies, and how to integrate methods for measuring oxygen content, perfusion, and eGFR to determine functional kidney tissue mass. 

These questions and many more abound in the study of renal fibrosis and highlight the need to develop and disseminate reliable methodologies. This Methods Collection aims to compile tried-and-true experimental measurements, state-of-the-art techniques, and novel experimental procedures. By fostering collaboration, this collection hopes to contribute to the quest for effective regenerative treatments for renal fibrosis, ultimately reducing the burden on ESRF patients within our healthcare systems.