Hello and welcome,
I am not familiar with Naturopathic Doctor's but do know there is a place for more then one kind of medicine. After 4 weeks of treatment I am wondering if you feel any better off the PPIs ?
From what I know the gold standard for determining low stomach acid is the Heidelberg test. This test has the patient swallow a tiny capsule, that contains a microtransmitter that measures the baseline pH (acid/alkaline level) of the stomach. The lower the pH, the more acidic. Next, the patient drinks a baking soda solution, and the transmitter measures the drop in acidity. The pH is recorded long enough to see how soon the stomach acid recovers to high acid levels.
I am sure you will hear from other members that will have better knowledge re to little acid.
Welcome to HealingWell and I hope you stick with us.
Kindly,
Kitt