It seems that if I were an anosognosic, I would make some observations only indirectly related to the affected limb that they don't seem impaired at making. For instance, even if I didn't notice that I was typing with one hand, I would probably remember having been to the hospital, or hearing a friend point out that one of my limbs looks awfully limp (even if I didn't know what they were talking about). Since I haven't made such observations, my probability that I'm anosognosic (at least about a limb or anything that observable) is lower than the prior.