Positives

• ME/CFS and Long COVID patients use the 2-day CPET to objectively prove post-exertional malaise, providing tangible evidence that performance collapses on day two Workwell Foundation.
  
  
• Patients pursuing disability benefits use the 2-day CPET to demonstrate their symptoms are not deconditioning, with the protocol now in ACSM exercise testing guidelines Workwell Foundation.
  
  

Negatives

• Patients commonly experience moderate to severe PEM crashes lasting weeks or months after testing, including profound fatigue, cognitive dysfunction, and flu-like symptoms Workwell Foundation.
  
  
• Severely affected patients risk lasting baseline deterioration, so the test is contraindicated for those who are already bedbound or housebound Bateman Horne Center.
  
  

Hurdles & Side Effects

• Patients face very few qualified testing centers worldwide, often requiring travel to Workwell or affiliated labs that worsens the post-test crash Workwell Foundation.
  
  
• Insurance rarely covers the 2-day protocol, leaving patients to pay thousands out of pocket while disability examiners may still dismiss the results MEpedia.