The Lomina Calprotectin Test is a qualitative lateral flow membrane immunoassay for the detection of human fecal occult blood. The membrane is pre-coated with an anti-calprotectin antibody in the test area of the strip. A mixture of stool and reagent migrates across the membrane where an immunochemical reaction occurs during capillary migration and reacts with the anti-calcprotectin on the membrane to form a coloured strip. The presence of the coloured band in the test area indicates a positive result, while its absence indicates a negative result. As a check on the procedure, a coloured band always appears in the control area, indicating that the correct volume of sample has been added and membrane activation has occurred.