Take a sample of stool using the enclosed measuring spoon. If the samples are liquid, collect one level spoonful and dilute with the liquid contained in the bottle. Homogenize well, taking care to prevent foam formation. If the samples are solid, remove the excess amount with a spatula or clean object, then dilute and homogenize as indicated above. Plunge a strip, with the arrow pointing down, into the liquid. The red portion of the strip must not be immersed in the liquid. Wait at most 10 minutes and interpret the result by comparing it with Photo 5. To safeguard the reagents’ stability, take care to close the tube containing the strips immediately.