Coproporphyrin III is widely used in medical diagnostics as a biomarker for various disorders related to heme biosynthesis, particularly porphyrias. It helps in identifying and monitoring conditions such as acute intermittent porphyria and hereditary coproporphyria. In research, it serves as a key compound in studying heme metabolism and enzymatic pathways. Additionally, it is utilized in biochemical assays to understand oxidative stress and mitochondrial function. Its role in these areas makes it a valuable tool in both clinical and laboratory settings.