If she is a new, inexperienced nurse, it seems more likely that what she notices will be something like:
- My gran had that and...
- The lecturer mentioned in passing...
Stuff that's quite unusual, so other staff might not spot the significance immediately, but this
particular nurse has a reason to know it.
It would help a lot if you could give some details of what the situation is, and what you're trying to achieve with the scene. Is it the patient who's important, or the nurse? Is this just a generic MC-saves-the-day scene, or does what happens in this scene have implications later on? Why is the patient in hospital - were they admitted as an emergency, or as an elective? Is it a little cottage hospital, a district general, or a big teaching hospital? Also, what country are you in? People get ill and injured in pretty much the same way all over the world, but hospital procedures differ between countries - and so do the drugs used, or even the names for the same drugs.
There is also the aspect of, do you want everyone else to look incompetent, uncaring, or careless? If the other staff - doctors, nurses, pharmacist - have all missed this, why did they miss it? Yes, people make mistakes - that's why they call it human error - but when you make a scene out of it in a book, you're making your heroine look good by making everyone else look bad.
Also, why is the doctor unavailable? The bigger the hospital, the less likely that a doctor is going to be unavailable. If it's a drug related problem, the ward staff will be able to contact a pharmacist - even if there isn't a 24-hour residency, the emergency duty pharmacist will be contactable by phone.
To me, this leans towards there being a problem that
this nurse knows how to solve because of some kind of personal knowledge - that steps around all the business of who's available for advice, and what professional experience people have.
For instance, try this:
The patient has an infection. They've been trying all kinds of antibiotics and stuff, and nothing's working. The patient is sinking, and it's looking bad. Samples have been sent off for cultures, but results aren't back yet. Suddenly, the nurse remembers that she'd been talking to the patient a few days ago about his trip to Canada, and how he was visiting family and they had a lake house, and it was really nice. She'd said that she, too, had relatives in Canada with a lake house (they're popular in some areas of Canada), and one of her cousins had picked up a really bad infection while they were out there, and nearly died....
The nurse remembers the name of the infection and tells the doctor. The doctor looks it up, realises that it matches the patient's symptoms, and changes the antibiotics (to an antifungal, I think, from memory), and the patient starts improving.
Pats on the back for the nurse, because it's a rare infection that wouldn't have been thought of until the cultures came back, and by then the patient might have been dead...
This is a real case that was written up in a medical journal - in the case report, the second patient's infection was treated quickly because the author of the report had seen the first patient and remembered the symptoms.
If that sounds like something you could work with, I could see if I can find the case report again.
I'm a pharmacist - I've worked in hospitals for 16 years. I used to work on the wards; now I provide clinical advice to the people (doctors, nurses, pharmacists, etc) who work at the sharp end. The coffee quotient is better, and I get to deal with the weird stuff that other people can't.
If the rare infection doesn't float your boat, I might be able to think of something else, if you can give some details about what sort of thing you're trying to accomplish etc.