It depends: When you take a blood thinner(which one are you taking??/), the doctors monitor the degree of effect on your blood. These tests guide us as to when to make dose adjustment to fine tune the blood thing to a safe yet effective level. Most likely your blood containing phlegm will clear up itself. But if it gets worse then you will need to get your blood checked even if it means going to ER(Emergency
Answered 1/4/2016
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