Final answer:
During a lung biopsy, the patient should lie on the side of the bed or rest their arms on pillows, hold their breath in midexpiration, and a chest x-ray is done immediately afterwards to check for pneumothorax.
Step-by-step explanation:
For a lung biopsy, the patient should be positioned lying on the side of the bed or with arms resting on pillows over the bedside table. It is crucial to have the patient hold their breath in midexpiration during the procedure. After the biopsy, a chest x-ray is performed immediately to check for the complication of pneumothorax, where air enters the chest cavity and might cause lung collapse. A sterile dressing is then applied to the biopsy site for protection.