The pregnancy test PT refers to plasma prothrombin time. Plasma prothrombin time is the more sensitive and most commonly used screening test for exogenous coagulation systems, and is observed by adding calcium ions and tissue factor or tissue thromboplastin to the plasma being examined. The value is converted to the International Normalized Ratio (INR) to determine normality. Pregnancy is a special physiological period for women, in order to adapt to the physiological needs of the body for delivery, the body is in a physiological state of hypercoagulability, pregnant women’s coagulation indexes will have greater changes than normal people, PT may also be accelerated accordingly. If you have abnormal pregnancy PT test results, please go to the hospital as soon as possible, and let the doctor formulate a diagnosis and treatment plan according to your condition, so as not to delay your condition.