I think the value in regular blood tests is to get an idea of what normal values are for you specifically. For some diseases/conditions the blood levels have su

I think the value in regular blood tests is to get an idea of what normal values are for you specifically. For some diseases/conditions the blood levels have such a big range that it is more useful to know the delta. We hardly ever measure the “good” or stable cases so when we start testing stuff when we are ill there is very little data on what is normal or even normal for you. Ive heard of cars where due to family history someone preemptively screened on certain blood values. When those changed they knew something was up, even though the value was still within normal range it was up 100x for them.