Once the Need for Long-Term Home O₂ Therapy Has Been

Multiple Choice

Once the need for long-term home O₂ therapy has been documented, why should repeated laboratory assessment (ABG or oximetry) be conducted?
1) To follow the course of the disease
2) To assess changes in clinical status
3) To facilitate changes in the prescription

A) 1 and 2 only
B) 2 and 3 only
C) 1 and 3 only
D) 1, 2, and 3