Colorectal cancer can evolve without any early warning of inflammation, and cancer can spread to other parts of the body after years of growth in the inner wall of the large intestine. Before the onset of any symptoms, the hyperplasia of the tissue usually infiltrates a small amount of blood, which is excreted in the stool. Fecal blood is the only abnormality that can be identified in early gastrointestinal tumors. Fecal occult blood test can detect a small amount of blood in the stool. Multiple and sustained occult blood test positive, indicating chronic gastrointestinal bleeding, should be further vigilant for the presence of gastrointestinal tumors. When normal people ate animal blood and chlorophyll containing food, occult blood test was negative. Stool occult blood test (FOB) is one of the commonly used detection methods in clinical practice and is of great value in the diagnosis of gastrointestinal bleeding. It is often used as a screening indicator for early diagnosis of malignant tumors in the digestive tract. Experts suggest that frequent gastrointestinal discomfort, chronic diarrhea, fecal obstruction and other symptoms should be promptly detected fecal occult blood for treatment. The experiment was quick, simple and painless. To improve the detection rate of blood in the stool, stool samples can be collected many times.
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