Tests - confirm or confuse?

I was just replying to a MTB at a forum about Amniocetisis, and this topic about medical tests just come to mind.I remember during my preggie days, we went through different kinds of tests from the OSCAR test, to detailed scan, to blood test for gestational diabetes and even tread on the topic of Amniocetisis. How we even tread on this topic of Amnio was that during my 20th-week detailed scan, gynae detected a "golf ball" (white spot) in Ariel's heart. This "golf ball" phenomenon could signify the possibility of Down syndrome particularly in Western babies. Amnio is then the next test to confirm. As you may have expected - I've of course, objected to the idea of an amnio. Although this 'golf-ball' thingy did not bother me that much, but it is nagging! At the back of your mind, you can't help but wonder: "What if?"

Tests, tests, tests - sometimes, the more we want to know and to confirm, the more confused we become as a result of these tests. After all, lab tests can get screwed up, risks are after all just risks, not facts; and stats are just stats, not absolutes. And even after knowing the test results, it doesn't change certain facts and may not necessarily alter our decisions.

So, why do we still go for tests? Maybe, it's just in our human nature - to want to know and to confirm, and yet get troubled by the results? The analogy is just like that of a horror movie. Living entirely by faith is not easy and might not even be achievable for a control freak like me, but I've come to realise that sometimes, living on uncertainties can be a good thing after all.