Medical professionals can do this by injecting a radioactive isotope into the bloodstream and follow it's progress using imaging equipment (MRI for eg).
I can't think of way to do this at home.
If...
starting in the left atriumit goes throught the bicuspid valve (left atrioventricular valve)into the left ventriclethrough the aortic semilunar valveinto the aortadown the descending thoracic...