Here's the thing though, doctors have a long storied background of not knowing what the hell they're doing. History is filled with stories of hilarious medical ineptitude, and in all likeliness, today's medical practices will be similarly snorted at 100 years down the road.
Empty definition, containing nothing; having none of the usual or appropriate contents: an empty bottle. See more.
Use the ISBLANK function to see if a cell is empty or not. For example, =ISBLANK(A1) will return TRUE if A1 is empty, and FALSE if A1 contains text or formulas. It's probably best to think of ISBLANK as meaning is empty since it can return true when cells look blank but aren't.