Doctor, respiratory therapist, or pulmonary lab technician.
Puncture can be painful.
Blood gas syringe and needle, and blood gas analyzer. To evaluate the lungs' ability to provide blood with oxygen and remove carbon dioxide, and to measure the acidity of the blood. How it works The blood's acidity and concentrations of various gases in the blood can be measured in the laboratory and compared with normal values to determine how well the lungs are working. The person performing the test may first check your circulation by pressing on the radial and ulnar arteries of your wrist. Failure to flush within 5 seconds indicates decreased blood flow.