Problem
CC: "I have been experiencing persistent coughing with yellowish sputum, chest tightness, wheezes, and shortness of breath when engaging in physical activities."
Finalized Diagnosis is COPD. Prescribed Albuterol inhaled 180mcg (2 puffs) to be inhaled PO inhaled q4-6hr to relieve the symptoms.
What diagnostic test to order in a follow-up visit for this case study patient to ensure effective treatment? What is average measurement should be?