Thanks Riverwild. I thought your "vial and box" comment was in answer to the question of whether people are currently having their blood/liver checked i.e. thought you were suggesting that people should be asking for a vial (of blood) to get it checked themselves.

It doesn't seem the liver is being checked regularly as part of standard protocol? So, I suppose this letter was just to advise doctors of the risk, and to tell them to casually observe if their patients start turning yellow or getting very sick then.

Cherie