Increased Excretion of Mast Cell Mediator Metabolites During Mast Cell Activation Syndrome
21st March 2025
Joseph H Butterfield (2023). This is a retrospective cohort study exploring biomarkers in MCAS diagnosis. While an increase in serum tryptase by 20% plus 2 ng/mL is required for an MCAS diagnosis, there is no agreement on what counts as significant rise in urinary metabolites such as prostaglandin D2, histamine, or leukotriene (which are also linked to MCAS episodes). The study finds that the measurements of all three urinary metabolites together is helpful for diagnosis.
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