Absorbibng blood thinners...My doctors are clueless..HELP PLEASE

I hope someone can help me...I recently have had heart problems (I am 4 years out) and have been taking Warfarin for thinning the blood...WHen I have went in for my blood tests they say the Warfarin is not showing up as almost non existent in my system....Is it possible that the 5 mg. pills are NOT BEING absorbed in my system...The doctors are saying I am one of a kind and they have never seen this happen before....Subsequently they are uping my dose....Has anyone else encountered a problem like this and what was the outcome? thanks ahead of time....This is scary to me as the Warfarin is keeping me safe from a stroke and now I feind out they are not even working!!!!!!

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