The cause of occult blood in stool refers to a small amount of bleeding in digestive tract, destruction of red blood cells by digestion, no abnormal changes in stool appearance, and no diagnosis can be made by naked eyes and microscope.
Normal people lose about 0.5- 1.5 ml of blood every day during the renewal of gastrointestinal mucosa epithelium, which belongs to normal physiological bleeding. However, if the digestive tract loses more than 2 ml of blood every day, it means that the digestive tract is pathological bleeding.
If the patient vomits fresh blood or brown gastric juice, the stool is black tar-like or bloody, which is called dominant bleeding. When the amount of bleeding is as small as 5ml per day, blood in stool can't be observed by naked eyes, and blood can only be detected by chemical test, it is called FOB, or fecal occult blood for short.
Usually, this small amount of obscure gastrointestinal bleeding, with normal stool color, is not easy to be found by patients because there are no obvious discomfort symptoms, but it is indeed an important manifestation of organic lesions in the digestive tract. Therefore, if we can check occult blood in the stool in time, we can find the organic lesions in the digestive tract early.
What about occult blood in stool (1) If there are alarm symptoms such as epigastric discomfort, atrophic gastritis, gastric polyp, gastric ulcer, subtotal gastrectomy, family history of gastric tumor, unexplained emaciation, fatigue, anemia, etc., or there are no clinical symptoms after physical examination, you should do gastroscopy first, and then do colonoscopy if there is no abnormality.
(2) If you have symptoms of lower abdomen discomfort and swelling, changes in defecation habits, a history of intestinal polyps, and a family history of colorectal cancer, cholecystectomy and appendicitis, you should do colonoscopy first, and then do gastroscopy if there is no abnormality, or do gastrointestinal endoscopy at the same time.
(3) If occult blood in stool is repeatedly positive and there is no obvious abnormality in gastroscopy and enteroscopy, you can choose capsule endoscopy or enteroscopy with balloon to check whether there is any disease in the small intestine, or cooperate with tumor markers, abdominal CT and other related examinations.
The clinical significance of fecal occult blood is 1. In the early stage of digestive tract cancer, 20% patients can be positive in occult blood test, and the positive rate of occult blood in the late stage can reach over 90%, and it can continue to be positive. Therefore, fecal occult blood test can be used as the first choice for screening digestive tract tumors.
2. The fecal occult blood test of patients with gastrointestinal bleeding and peptic ulcer is mostly positive or intermittent.
3. Diseases that can lead to erythrocytosis in feces, such as dysentery, rectal polyps, hemorrhoid bleeding, etc. It can also lead to a positive reaction of occult blood test. Pay attention to the combination of gastrointestinal endoscopy to further check for abnormalities.
The detection of fecal occult blood needs to collect 3 fecal samples for fecal occult blood detection. It is usually enough to collect a stool sample with the end of a cotton swab. Collect stool samples at different times every day, because colon cancer will bleed from time to time, not continuously.
You can buy a fecal occult blood test kit (such as Ma Yinglong Daan genetic diagnosis test kit) at the pharmacy and do it at home, or your doctor will test your fecal occult blood during your appointment.
After the fecal sample is collected in a clean container, by monitoring the color change on the test paper card, or sending the sample directly to the doctor on duty for analysis with special containers and envelopes, your doctor on duty will observe and analyze the sample with chemical reagents under the microscope.
Ma Yinglong Daan Jean? Stool occult blood test reagent? It can detect hemoglobin in feces of patients with hematochezia, so as to screen malignant tumors of digestive tract such as rectal cancer and find early symptoms of rectal cancer. The detection reagent has an effective detection rate of more than 87% for early digestive tract malignant tumors related to rectal cancer, and has obvious effects on the discovery and prevention of early digestive tract related diseases.
When there are symptoms of bloody stool, vigilance and timely detection can effectively screen malignant tumors such as rectal cancer and carry out corresponding treatment.