Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for severe trouble breathing, blue or grey lips, fainting, sudden severe chest pain, confusion, or symptoms that appear immediately life-threatening.
And for anyone, someone who:
Contact your transplant team urgently on the same day if you develop a fever at the threshold they gave you, worsening breathlessness, a new cough, reduced home lung-function readings, wound redness or drainage, or vomiting that prevents you from keeping medicines down.
Also call promptly if you miss an anti-rejection dose or cannot obtain your medicines.
Questions about mild medicine effects, activity progression, paperwork, or routine test results can usually wait for normal clinic hours unless your transplant team has told you otherwise.
Every sign above is quoted from the sofidex article on Lung transplant. If you are not sure, err upward — it is always reasonable to be checked.