Checking your NLR (neutrophil-lymphocyte ratio). Basically teasing out the possibility of unsuspected inflammation/infection. Being that your work in ICU (thank you very much

I have two children that are RN's). You're more susceptible than the general population to acquire whatever pathogen might be floating around, without symptoms so to speak.
Prolactin functions in a dual manner, as a tropic hormone and a type of cytokine- immunomodulator. In the context of inflammatory response, prolactin can transiently and acutely rise. I've personally seen several individuals with acute changes in their PRL due to infections/systematic inflammation. They were chasing the wrong cause.
Then again, it could totally unrelated to the aforementioned.