Fecal blood, simple examination method, intuitive results, can initially provide information on the function of the digestive tract or pathological changes, as well as indirectly determine the functional status of the gastrointestinal, pancreatic, hepatobiliary. The principle of occult blood test is that hemoglobin has the function of peroxidase, which can decompose hydrogen peroxide to release oxygen. The latter oxidizes benzidine or guaiac wood to blue, and the color develops faster and deeper, suggesting that it is in the feces. The more blood contains. The occult blood test cannot distinguish between upper gastrointestinal bleeding or lower gastrointestinal bleeding.

Basic Information

Specialist classification: Digestive examination classification: feces / parasitic examination

Applicable gender: whether men and women apply fasting: not fasting

Analysis results:

Below normal:

Normal value:
no

Above normal:

negative:
Normal, no visible blood or stool color is normal to the naked eye.

Positive:
Abnormal, upper gastrointestinal bleeding, feces mixed with blood, dark red blood or tar-like stool; bright red blood is mostly in the lower part of the small intestine or upper part of the colon; blood attached to the surface of the feces is the rectum or anus (anal fissure, sputum) bleeding. Ulcerative colitis or colon cancer is often mucus and blood.

Tips: When occult blood test fecal occult blood, please avoid eating red meat, liver and spinach, cabbage, broccoli and other foods three days before collection to avoid false positive results. Normal value

No blood or stool color was found to be normal to the naked eye.

Clinical significance

Abnormal results:

Upper gastrointestinal bleeding, feces mixed with blood, dark red blood or tar-like stool; bright red blood is mostly in the lower part of the small intestine or upper part of the colon; blood attached to the surface of the feces is rectal or anal (anal fissure, sputum) bleeding. Ulcerative colitis or colon cancer is often mucus and blood.

Several kinds of diarrhea characterized by pus and bloody dysentery dysentery amebic dysentery Campylobacter enteritis schistosomiasis ulcerative colitis epidemiological significance is popular, can also be distributed more scattered, low epidemics, local epidemic has been In the epidemic area, there is a history of contact with the infected water. The appearance of feces is less, the mucus is mainly, and there is a small amount of blood and feces. The feces are mixed with dark red blood and a small amount of mucus, odorous paste → watery stools → pus and blood stools There may be pus and mucus mucus, pus and blood mixed, mucus will have blood, odor odor pH alkaline (about 8.0) acidity (6.1 ~ 6.6) - alkaline - microscopic examination of cell components mainly white blood cells, a large number of neutral Granulocytes, pus cells, macrophages, epithelial cells, red blood cells, red blood cells, necrotic substances, visible amoeba trophozoites and Charcot-Ryden crystals visible polynuclear white blood cells and red blood cells visible red blood cells, white blood cells and schistosomiasis White blood cells, red blood cells can be seen in the eggs. The characteristics of red blood cells are fresh, not deformed, scattered in old, condensed into piles, scattered in a string like 缗 缗, scattered fresh and old, the dynamic types and quantity of fresh microscopic bacteria are reduced, the variety and quantity are more visible There are many different types of small bacilli, and there are many bacteria in the fecal matter. On the contrary, less systemic symptoms are more severe and less severe. Generally, the symptoms and characteristics of schistosomiasis are different, which can be severe and severe. Sigmoid colonoscopy for diffuse mucosal inflammation, ulcers of different degrees and different sizes of ulcers, flask-shaped, can be covered by blood clots, no diffuse mucosal inflammatory changes - mucosal congestion, water intestines and may have yellow small particles of chronic inflammation The ulcer is deeper.

Need to check the crowd:

Patients with blood in the stool, abnormal feces, difficulty in bowel movements, erosion of the digestive tract, etc.

Positive results may be diseases: anal fissure, hemorrhoids, other vibrio infections

Requirements for inspection:

1. Please avoid digging the part of the toilet urine and tap water when collecting; do not place the feces directly on toilet paper or paper towel.

2, the blood attached to the surface of the feces is the rectum or anus (anal fissure, sputum) bleeding. Ulcerative colitis or colon cancer is often mucus and blood.

3. When taking iron or eating animal blood, lean meat or a large number of green leafy vegetables, a false positive reaction may occur. Therefore, in order to eliminate the factors affecting the test results, it is best to fast the food for 3 days before the occult blood test.

Preparation before inspection:

When occult blood test fecal occult blood, please avoid eating red meat, liver and spinach, cabbage, broccoli and other foods three days before collection to avoid false positive results.

Inspection process

The principle of occult blood test is that hemoglobin has the function of peroxidase, which can decompose hydrogen peroxide to release oxygen. The latter oxidizes benzidine or guaiac wood to blue, and the color develops faster and deeper, suggesting that it is in the feces. The more blood contains. The occult blood test cannot distinguish between upper gastrointestinal bleeding or lower gastrointestinal bleeding.

Not suitable for the crowd

There are no taboos.

Adverse reactions and risks

There are no related complications.