Positive 3P test. This means that the patient has developed disseminated intravascular coagulation, which is common in secondary fibrinolysis, mainly in the early and middle stages of disseminated intravascular coagulation, and in the late stages of disseminated intravascular coagulation, the 3P test is usually negative. 3P test is known as the plasma ichthyosemicarbazone sulfate paraclotting test, which is based on the addition of ichthyosemicarbazone sulfate solution to the plasma under test. If there are soluble fibrin monomers or fibrin degradation products in the plasma, the addition of fisetin sulfate will cause the soluble fibrin monomers or fibrin degradation products to polymerize and form a fibrous substance visible to the naked eye, which can be judged as positive at this time. The presence of soluble fibrin monomers or fibrin degradation products in the plasma indicates that disseminated intravascular coagulation is occurring in the body and is only seen in the early and middle stages of disseminated intravascular coagulation.