Are there any home tests for asthma?

Sort of. If you have a diagnosis of asthma from a qualified health care provider, you may be provided with a peak flow meter to follow your peak expiratory flow rates at home. This will help you manage your asthma better.
Not exactly. Though a physician diagnosis is needed, the use of a peak flow meter to derteimne your daily asthma status is very helpful in preventing or minimizing attacks during the day.