Poor coagulation function may be caused by genetic factors, drug effects, and diseases, as detailed below:

1. Genetic factors: Poor coagulation function may be caused by genetic mutations or defects, such as hemophilia.

2. Drug effects: Certain drugs, such as anticoagulants and antiplatelet drugs, may interfere with the coagulation process, leading to poor coagulation function.

3. Diseases: Certain diseases, such as liver disease, kidney disease, leukemia, etc., can have adverse effects on the coagulation system, leading to poor coagulation function.

In addition to the relatively common reasons mentioned above, there are other possible reasons, such as blood dilution, lack of coagulation factors, and abnormal coagulation factors.

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