Being declawed, Darling has been strictly indoors for a number of years now, and Barbara has wormed them often enough, and is the type to notice if any of her furkids had worms. I know how hard this guy is to even put into a carrier, and getting blood from him usually means the doc loses more than the cat does. I think as long as his appetite stays good, and he seems content, then maybe nature should just take it's inevitable course. Darling could well be nearer to 20, so stressing him out with tests at his age may send him over the edge. And getting meds into him is not possible anyway. He fights tooth (and more tooth..seeing as he's declawed) I think he's at that age where when he stops eating, or shows signs of decline, he'll be held by Barbara, and kissed over to the Bridge.