Don't know about the time but I did see an article
Post# of 30028
Check the 5 day chart on Quest Diagnostics. Appears to have had a definite impact:
http://finance.yahoo.com/q/bc?s=DGX+Basic+Chart&t=5d
Obviously it's a lot easier for a company such as Quest Diagnostics with a multitude of diagnostic test already in use to absorb the news than it is for a company such as AMBS with a single test in development.
Monday will be interesting.