[pbjerkeseth]

Blood in my case, and it would probably be obvious. In general though I think a lot of these questions are answerable by paying attention to the changes in your body, how you're feeling, researching, and raising thoughts/concerns/etc with your primary cary provider when that comes up short. No need to go searching for issues if there isn't some leading indicator that sticks out to you as something to be curious about, or there isn't some related family medical history.