Mr. C. has been sick for awhile.
He lost a lot of weight but his wife knows he's starting to improve.
"How do you know?" I asked.
"Two reasons, " she stated, "he recently started to play his guitar again, which he hadn't wanted to do the entire time he was ill, and his penis is starting to grow and get hard again. It was shriveling up while he was ill. We're both glad to see it starting to come around again (She grinned)."
He's 82 years old and they've been married almost 60 years.
I think her clues to his recovery are probably as good as, or much better than any sophisticated medical test could possibly be.