Serum agglutination test for typhoid and paratyphoid fever (Widal's test, Widal reaction, Widal)

This test (also known as the fatda Widal test) can help diagnose typhoid and paratyphoid fever. In general, patients' antibodies appear more than 1 week after the onset of the disease and gradually increase thereafter. Basic Information Specialist classification: Digestive examination classification: blood examination Applicable gender: whether men and women apply fasting: fasting Tips: Do not eat too greasy, high-protein foods the day before the blood draw, avoid heavy drinking. The alcohol content in the blood directly affects the test results. Normal value 0<1:80H<1:160. A, B, and C are all <1:80. Clinical significance O and H agglutination price increase can diagnose typhoid; O and A, B, C (one of them) when the agglutination price increases, can diagnose one of A, B, C. The most significant one is that its agglutination price gradually rises and exceeds the reference value. Positive results may be diseases: paratyphoid A, intestinal typhoid, paratyphoid, intestinal typhoid perforation, typhoid myocarditis, typhoid First, the precautions before blood draw: 1, do not eat too greasy, high-protein food the day before the blood, to avoid heavy drinking. The alcohol content in the blood directly affects the test results. 2. After 8 pm on the day before the medical examination, you should start fasting for 12 hours to avoid affecting the test results. 3, should relax when taking blood, to avoid the contraction of blood vessels caused by fear, increase the difficulty of blood collection. Second, after blood draw should pay attention to: 1. After blood is drawn, local compression is required at the pinhole for 3-5 minutes to stop bleeding. Note: Do not rub, so as not to cause subcutaneous hematoma. 2, the pressing time should be sufficient. There is a difference in clotting time for each person, and some people need a little longer to clotting. Therefore, when the surface of the skin appears to be bleeding, the compression is stopped immediately, and the blood may be infiltrated into the skin due to incomplete hemostasis. Therefore, the compression time is longer to completely stop bleeding. If there is a tendency to bleed, the compression time should be extended. 3, after the blood draw symptoms of fainting such as: dizziness, vertigo, fatigue, etc. should immediately lie down, drink a small amount of syrup, and then undergo a physical examination after the symptoms are relieved. 4. If there is localized congestion, use a warm towel after 24 hours to promote absorption. 3. Please inform the doctor about the recent medication and special physiological changes before the test. Inspection process Each patient was routinely subjected to blood, stool culture and fat Dar's reaction after hospitalization, and then the Feidashi reaction was reviewed once a week for a total of 3 weeks. The positive standard of the laboratory's fatda reaction was H≥1:160. O ≥ 1:80, the standard is negative. Not suitable for the crowd There are no special taboos. Adverse reactions and risks There are no related complications and hazards.