Sam, I can't help but agree with sd. Just go ahead and get started on killing whatever parasites you can. The first time you do a liver flush, it may go just great,...or you might only barely access the duct, getting out a few measly stones. But go ahead and get started on the parasite killing herbs. You can keep a record of what you've done and with what results, but let's face it,...you aren't doing your 'doctorate paper' on this. You have a long road ahead and there will be setbacks. Please make sure you follow Hulda Clark 's instructions on the liver flush. It's an 'all day and most of the next morning' process. Kill your parasites with herbs before the cleanse if at all possible. Use the zapper too. And if someone who has done the Liver Flush before will volunteer to take your calls at any time on the night of your first cleanse, better yet.