calprotectin

This term is a highly specialized medical biomarker used primarily in gastroenterology. It is used to distinguish between inflammatory bowel disease (IBD), such as Crohn's disease or ulcerative colitis, and non-inflammatory conditions like irritable bowel syndrome (IBS). Because it is a protein released by neutrophils during an inflammatory response, its presence in stool samples provides a non-invasive window into the state of the intestinal mucosa.

As a biochemical substance and a protein, the term is treated as an uncountable noun in clinical and laboratory contexts. It refers to the substance itself rather than individual molecules, meaning it does not typically take a plural form in medical reporting.