Prothrombin time (PT)

Prothrombin time is also a more sensitive screening test for the coagulation system. Prothrombin time mainly reflects whether the external clotting is normal. Basic Information Specialist classification: growth and development examination classification: blood examination Applicable gender: whether men and women apply fasting: fasting Analysis results: Below normal: Found in women oral contraceptives, thromboembolic diseases and hypercoagulable state. Normal value: Adult: 11-15 Newborn: 13-17 Above normal: Prolonged to be seen in the absence of congenital coagulation factors. negative: Positive: Tips: Do not eat too greasy, high-protein foods the day before the blood draw, avoid heavy drinking. Normal value Adult 11~15s. The newborn is extended by 2~3s (Quick one-step method). 18~22s (Wars-Seegers modified two-step method). Clinical significance Abnormal result Prolonged prothrombin time a) Congenital coagulation factor deficiency, such as prothrombin (factor II), factor V, factor VII, factor X, and fibrinogen deficiency. b) Acquired coagulation factor deficiency such as secondary/primary fibrinolysis, severe liver disease, and the like. c) Using heparin, antibodies to prothrombin, factor V, factor VII, factor X and fibrinogen in the blood circulation can cause prolonged prothrombin time. Prolonged prothrombin time is seen in women's oral contraceptives, thromboembolic diseases, and hypercoagulable states. People who need to be examined for wound healing, women who take birth control pills for a long time. Low results may be diseases: high results of hemolytic uremic syndrome may be diseases: hepatic artery occlusion, pediatric liver failure, hereditary coagulation factor VII deficiency, gallstone considerations 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 physical examination, fasting should be done to avoid affecting the detection of indicators such as blood glucose in the second sky. 3, should relax when taking blood, to avoid the contraction of blood vessels caused by fear, increase the difficulty of blood collection; If you have a history of fainting, please explain in advance and we will make special arrangements; Second, should pay attention after blood draw 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. Inspection process Inspection method: draw blood. Not suitable for the crowd Hemophilia and diffuse intravascular coagulation. Adverse reactions and risks Discomfort: There may be pain, swelling, tenderness, and visible subcutaneous ecchymosis at the puncture site.