@crinrict In lower levels, there were always at least some patients with red heart after loading the Hospital lot (and treating them was no problem for me - this worked just fine), but since leveling up to the Nurse practicioner as mentioned, this doesn't work.
1) I get notification if I want to go with my sim to the hospital when it's time, so I click that I want to go.
2) After hospital lot opens I see only patients with blue hearts - that don't have a diagnosis.
3) I randomly choose one of the blue heart patients and give them the basics (check up of ears, eyes, temperature, ...), then I do x-ray (with calibrated machine), test on the running machine - everything successfuly.
4) I need to get the accurate diagnosis in order to treat the patient correctly, but this option just doesn't show up (even though in previous levels it worked just fine) - that means when I click on the diagnosis option all I see is multiple options (for example: no disease, llama disease - sorry my game is in Czech so I am not sure of English equivalents).
5) I cannot get ONE diagnosis in options even after running x-ray and running machine test multiple times again.
6) I try random diagnosis from the options I get because I am exhausted at this point and the working day is almost over.
7) I either get the diagnosis wrong or I get it right, but even if it's right, it doesn't count into the lower right corner with career pop up (diagnose and treat 2 patients).
Hope this is logical for you, I just don't know what to do anymore.