The Histamine Check Swab is a rapid, portable, colorimetric screening test for histamine. Using the test requires no instrumentation and produces an easy to evaluate color reaction in only 5 minutes. The single swab format for the test makes it easily portable for use at all points in the processing plant, on a receiving dock, at fish markets, and anywhere else where food needs to be rapidly screened for histamine. The Histamine Check Swab is the ideal option for rapid screening of various fish products, raw fish, bonito flakes, fish sauce for quality control and to select which samples may need to be submitted for further quantitative analysis.