Context: Spirometry is recommended to aid in diagnosis and management. It is the single best test for asthma. If the FEV1 measured by this technique improves more than 12% following administration of a bronchodilator such as salbutamol, this is supportive of the diagnosis. It however may be normal in those with a history of mild asthma, not currently acting up. As caffeine is a bronchodilator in people with asthma, the use of caffeine before a lung function test may interfere with the results. Single-breath diffusing capacity can help differentiate asthma from COPD. It is reasonable to perform spirometry every one or two years to follow how well a person's asthma is controlled.

Question: What is recommended to help in the diagnosis of asthma?
Answer: Spirometry

Question: Why is spirometry so commonly used to diagnose asthma?
Answer: It is the single best test for asthma

Question: What helps support the evidence of asthma?
Answer: If the FEV1 measured by this technique improves more than 12% following administration of a bronchodilator

Question: What substance can skew the results of an asthma test?
Answer: caffeine

Question: What test can tell the difference between asthma and COPD?
Answer: Single-breath diffusing capacity

Question: What is recommended for the diagnosis of COPD?
Answer: Unanswerable

Question: Why is spirometry used to diagnose COPD?
Answer: Unanswerable

Question: What is used to support a COPD diagnosis?
Answer: Unanswerable

Question: What can you take that will change the results of a COPD test?
Answer: Unanswerable

Question: How often should you use a bronchodialator to track how well COPD is controlled?
Answer: Unanswerable