Patent ID: 7517691

Claim:
A method of detecting the presence of occult blood in feces, comprising the steps of (a) providing a sheet of absorbent material impregnated with a liquid solution that reacts with feces to produce a color change when blood is present, said liquid solution comprising a mixture of a guaiac material and a peroxide, (b) placing said sheet absorbent in a packet and subsequently evacuating the packet to remove air therefrom and sealing the packet to prevent the liquid solution from escaping the packet until opened to use the impregnated sheet of absorbent material, said evacuated and sealed packet being essentially impermeable to light and air, (c) manually opening the packet and removing the impregnated sheet of absorbent material, and (d) collecting a sample of feces on the impregnated sheet of absorbent material, a color change appearing on the impregnated sheet of absorbent material in the presence of occult blood.