Jerry King7 said:well, I wasn't suggesting they'd run a targeted pregnancy test—more like, if she's getting blood drawn, would they just stumble upon it? since she was hospitalized for a while because of this... I'm just wondering if tests done for poisoning could accidentally pick up a pregnancy.
Basically, if you want to find something out today, you have to test specifically for it. Targeted. In other words, if they're just pulling blood for a CBC—a complete blood count—it doesn't actually cover everything, even if the name sounds like it does.
It’s the same thing when an unknown cause of death is being investigated—they test for common toxins. But to actually find out if something was in the blood, there has to be a reason to suspect it first.
All these tests are designed to use certain reagents—depending on the situation—that react to a specific substance.
If you aren't testing for pregnancy, you won't know if it's there or not. Now, whether they ran a non-standard pregnancy test on her just "in passing"—without any reason to—I honestly don't know...