LTB4 stimulates a number of leukocyte functions, including aggregation, stimulation of ion fluxes, enhancement of lysosomal enzyme release, superoxide anion production, chemotaxis, and chemokinesis. LTB4 is metabolized in leukocytes and hepatocytes to less active 20-hydroxy and 20-carboxy LTB4 and then further oxidized to ω-carboxy dinor LTB4 and ω-carboxy tetranor-LTB3. It is not excreted in the urine. Cayman's LTB4 Express ELISA Kit is a competitive assay that can be used for quantification of LTB4 in plasma and other sample matrices. The assay has a range from 15.6-2,000 pg/ml and a sensitivity (80% B/B0) of approximately 45 pg/ml.