ok, i am not great at story feedback but here goes:

Overall content: Nice shows lot of medical knowledge. that is always a good thing when writing stories

suspense: maybe this was intended but there is nothing for the reader to think about here

flow: smooth. the story runs on without wavering

imagery: i confess i dont like imagery much as i want the reader to imagine and in that sense i find yours just about right

i think it is a nice beginning and wish you the best