Rather than 'inactive' or 'reactive'!
It to me, [and I'm not a doc?] sounds like you are getting a full-workup for a the whole. W/blood tests for the CA19-9 Test one summary here:
http://www.labtestsonline.org/unders...19_9/test.html
This does NOT mean that you have any issues here? Just that it is something to TEST and hopefully rule out.. as are all your tests outlined.
As for Endo and Colon scopes? Just follow directions your doc or the specialist gives you TO THE LETTER! And, likely all will be fine. I've had both, more than once, and I'm still kicking stuffs! Usually the preps are worse than the actual tests..they either put you OUT or in 'twilight' [not really conscious]. There ARE times? Such as these, when it IS best to be OUT of it! Just ask solid questions about the 'care and feeding' of YOU both before and more importantly AFTER!
Then, there are the horrid 'waits' for test results. Some take a few days, others weeks! I've been thru soo many of these? You simply cannot allow yourself to panic, why? Because 95% of the tests are tame. Once you get any test results to worry about? THEN just find out about WHAT IT, whatever 'it' is? IS! Do not bust your brain with the what-ifs yet. Save your energies for the relief or the prospect of even more tests? THEN put your thinking cap on and read the stickies! Then cross bridges and panic if needed. Tho these days? Usually not needed - the panic, that is.
Hey, many here have been tested out the wazoo and beyond. Some to result, I'm luckily one of them [for several issues, including cancer-Got 4 months more to go and I'm at 5 YEARS! ], and others they simply don't know about ...YET.
Advice? Keep your head screwed on straight! You've got a doc who IS testing you right and proper so far, and You've got support here and elsewhere to get you thru! Never underestimate family and good friends! You'd be surprised how helpful all can be IF they can wrap their brains around your problems!
DON'T PANIC! Save it for later? Please??? Hugs and hope!!!! 's - j

Add this summary to info overload?:
http://www.questdiagnostics.com/hcp/...ml&labCode=SJC Fun reading!