The Limulus PS Single Test is composed of LAL endotoxin-specific single-test vials and an affinity resin suspension called PyroSep ™, designed to overcome any product interference by adsorbing potential endotoxin in samples while washing away the inhibitory components. When using this product, the endotoxin in the sample is adsorbed onto a capillary column filled with PyroSep ™ (an affinity adsorbent with histidine bound to a water-insoluble support via a spacer). Inhibitory substances contained in the sample are washed away, allowing the adsorbed endotoxin to be measured with the single-test format LAL reagent.