the thing about Spock is, like, whenever he comes in for a checkup or whatever, McCoy’s all like “god these readings are so fucked but that’s normal for you so… carry on i guess”
but unless I’m wrong about this (and I could be, i’m not That Deep into the lore yet) Spock is one of the first (if not the first) documented Vulcan-Human hybrid to survive into adulthood? so there actually isn’t an established normal for him. like you can take all the readings you want when he’s at rest and seems to be in good health and extrapolate from those, you can make predictions based on the norms of Vulcan anatomy and human anatomy, but there’s so much range between the two and so little precedent that there are bound to be unknowns
like
spock has two sets of eyelids and no one else knew about this until he temporarily went blind. if an entire second set of eyelids could come as a surprise just imagine what else is going on under the surface. there are so many question marks here.
i feel like this is what McCoy thinks about at 3am
Spock: Nothing to worry about, doctor, my Superior Vulcan Physiology ™ and I are in perfect operating condition
McCoy, watching the medical tricorder go the most batshit it’s ever gone during a routine physical examination: