Does anyone have any tricks to produce a sputum sample?

First thing in the morning after 2 puffs of albuterol and then nebulized hypertonic saline. Try 2 vials.

@jmr69 When nebulizing saline is not enough, I do some vigorous exercise or house or yard work after the neb. That usually does the trick for me. Sometimes a cup or two of Breathe Easy tea by Traditional Medicinals helps too. Available on line, at Walmart and in most large supermarkets.