For all that he sometimes seemed like the ditziest sensei they could ask for, Obito paid more attention to detail than he let on and was Hokage beside; Sasuke hadn't known him even after all these years to abuse his position for something trivial. If he had ordered, not just asked, Itachi to see a medic, then things had clearly progressed to a point when he was genuinely concerned.

It begged the question of how they'd missed it at home -- had he not been paying close enough attention? Itachi had always been a little prone to whatever bug was going around, but ...

"Who did you see?" He'd been foisted off on enough of the hospital staff that he had a decent idea of who did what by now, and if Itachi was in for any but the overall full barrage of tests, he could harass the specialists for information. "When are you in next?"