Because potatoes can provide a lot of vitamin C and inorganic salts such as calcium, phosphorus, iron, potassium, sodium, zinc, manganese and so on. Will affect the fecal occult blood test, and potatoes should be fasted when collecting fecal samples for occult blood test.

First, the fecal occult blood test is a method to determine gastrointestinal bleeding, which is mainly used to detect a small amount of bleeding that is invisible to the naked eye. Also known as o-toluidine method (OB). Fecal occult blood test is still the most widely used and evaluated test in colorectal cancer screening. This experiment is quick, simple and painless.

Second, matters needing attention

1 stool samples should be collected in the center of the stool block, and should not be mixed with anorectal bleeding. The stool should be fresh. In order to improve the probability of detecting blood in stool, stool samples can be collected many times.

2,3% hydrogen peroxide must be effective, and a positive control test should be done. Hydrogen peroxide should be coated on blood tablets, and foam can be used.

3 Do not eat animal blood, meat, liver, iron agents (ferrous sulfate, ferrous citrate, Hongbu pills, iron fumarate) and foods rich in chlorophyll (spinach, vegetables) within 3 days before the experiment to avoid false positive reactions; Do not take a lot of Vc or other reducing substances to avoid false negative reactions.

4 gingival bleeding, nosebleeds and menstrual blood can also lead to positive reactions.

5 utensils should be disinfected.

3. Potatoes, also known as potato tubers, contain a variety of vitamins and inorganic salts, which can provide a lot of vitamin C. Tubers also contain vitamin A (carotene), vitamin B 1, (thiamine), vitamin B2 (riboflavin), vitamin pp (nicotinic acid), vitamin E (tocopherol), vitamin B3 (pantothenic acid) and vitamin B6 (pyridoxine).