How does occult blood test work

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You then place the sampling stick with the stool sample in the collection container and snap the cap in place. You may either return the sample to your doctor or send it directly to the lab for analysis. There are several types of fecal occult blood tests, each with a different approach to collecting and testing stool. They include:.

The collection method for this test may depend on the manufacturer, but typically, you use a special spoon or other device to collect a sample of stool and store it in a collection container that comes with the test kit. The collection container is then returned to your doctor or a designated lab, by mail or in person.

Immunochemical testing is preferred over the guaiac fecal occult blood test because it's more sensitive. Also, it doesn't require any dietary restrictions before sample collection and testing can often be performed on a random stool sample. Guaiac fecal occult blood test gFOBT. For this test, your doctor typically gives you test cards that are used to collect stool samples from multiple bowel movements.

You collect a stool sample from each of two or three bowel movements in a clean container, usually taken on consecutive days, and then use an applicator stick to apply a smear of stool to a specific area of a card. After the samples are dry, you return them to your doctor or a designated lab, by mail or in person. Flushable reagent pad or tissue. You can get this kit at a store without a prescription. You place the pad or tissue in the toilet bowl after a bowel movement, usually on three consecutive days.

The pads change color when blood is present. Your doctor will review the results of the fecal occult blood test and then share the results with you. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. This content does not have an English version. This content does not have an Arabic version. Overview The fecal occult blood test FOBT is a lab test used to check stool samples for hidden occult blood.