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 difficulty breathing, blue or grey lips, fainting, confusion, heavy bleeding, or sudden severe chest pain.
And for anyone, someone who:
Contact your surgical team promptly if you have increasing redness, warmth, swelling, drainage, or opening of the incision.
Also call about a fever, worsening cough, increasing breathlessness, pain that is getting worse rather than better, or pain medicine side effects that you cannot manage.
Seek urgent medical advice for new swelling or pain in one leg, coughing up more than a small streak of blood, or a sudden decline in your breathing.
These are different from routine postoperative soreness and should not wait for a scheduled appointment.
Every sign above is quoted from the sofidex article on Open lung biopsy. If you are not sure, err upward — it is always reasonable to be checked.