Secretin, porcine, is primarily used in medical diagnostics and research. It plays a key role in assessing pancreatic function, particularly in tests like the secretin stimulation test. This test helps diagnose conditions such as chronic pancreatitis, pancreatic insufficiency, and Zollinger-Ellison syndrome by measuring the pancreas's ability to produce digestive enzymes and bicarbonate in response to secretin. Additionally, it is utilized in research studies to understand gastrointestinal physiology, including the regulation of gastric acid secretion and pancreatic exocrine function. Its application extends to investigating the role of secretin in various digestive disorders and its potential therapeutic uses.