A low activated partial thromboplastin time may indicate the presence of thrombophilia or a pre-thrombotic state. The activated partial thromboplastin time is the most sensitive and commonly used screening test for the endogenous coagulation system. A low value of this test may indicate that the coagulation system is in a hypercoagulable state, which may lead to a higher risk of thrombotic disorders, such as deep vein thrombosis, pulmonary embolism, etc. It may also be seen in patients with acute myocardial infarction, prolonged use of estrogenic contraceptives, and late pregnancy. In addition, acute myocardial infarction, prolonged use of estrogenic contraceptives, and late pregnancy may occur. It is recommended to improve the d-dimer and other related tests, in order to clarify whether there is thrombosis, and do a good job of preventing the formation of thrombus, if necessary, under the guidance of the doctor to apply anticoagulant drugs, such as warfarin, injection of low molecular heparin for treatment. It is recommended to consult a doctor for standardized diagnosis and treatment when necessary.