VALID MEASUREMENT METHOD FOR STOMACH ACID YOU CAN DO AT HOME
Test instructions
- buy ph test stripes. it must be a paper that has a graduation of 0.3 and the right range for urine. These papers are sold in pharmacies in every country in big packages of 100 stripes, because patients with kidney stones need them. Do not buy papers with a graduation of 1 or 0.5. thats too inexact. You wont be able to notice when your acid improves slowly day-by-day or even more slowly, week-by-week.
- discard the first morning urine. measure the ph of the second morning urine right before the first meal.
- measure the urinary ph 2 hours after the meal. You may want to set a timer - I always forget it without..
Which values are good?
Normal values depend of the food eaten, see below the two papers. Only solid food is useful, liquid food cannot be used as it does not trigger stomach.acid. This test method is only valid for the first meal because after the postprandial acid excretion there comes a base excretion when the alkaline digestive juices in the duodenum are produced. If foods follow each other, these acid and alkaline tides from the differnt meals overlap and annihilate each other.
Is this valid? How can stomach acid be measured via the urine?
This testing method relies on the alkaline tide phenomenon: for 2h after a meal, the urine becomes alkaline. This alkalinity corresponds to the acid secreted into the stomach. This correspondence is so good that it can be used for measurement. The simple reason for this effect is that when the stomach produces HCL, the same amount of a base is secreted into the blood. To maintain blood PH, the kidneys produce alkaline urine.
Paper 1: vegetarian meal
http://www.tropicalgastro.com/artic...-with-postprandial-urinary-alkaline-tide.html
see pdf below
meal:
150g of rice, 20 g sambar and 2 boiled eggs
testing method:
Patients were instructed to empty their bladder the next morning and subsequently a 20 mL urine sample was collected for measuring the fasting urinary pH. Patients then received a standard test meal and postprandial urinary pH was measured in a sample collected after two hours.
normal value:
ph diffence of the two measurements in healthy volunteers: 1.59 ยฑ 0.47 (mean ยฑ SD) = 1.0-2.8 (let's take this as the normal range)
(remark: there was also a liquid test meal. Using that, the ph difference was much smaller)
Paper 2: meal with fish
http://onlinelibrary.wiley.com/doi/10.1002/bjs.1800731124/abstract
see pdf below
meal:
150g rice (6.8g/100ml protein, 0.5g/100ml fat and 78.2 g/100 ml carbohydrate); 30 g fish (19.5 g/100 ml protein, 2.4 g/100 ml fat, 1.5 g/lW ml minerals); 20 g Dal or Bengal gram (17.1 g/100 ml protein, 5.3 g/100 ml fat, 78.3 g/100 ml carbohydrate); one boiled hen's egg (13.3 g/l00 ml protein, 133 g/l00 ml fat, 1 g/lW ml minerals) and two glasses of water.
measurement method:
same as paper 1, but they let the patients fast until noon.
normal value:
the ph difference of the two measurements in healthy volunteers was 3.1 (mean).
unfortunately, here only the mean value was presented. the range was not given.
This mean value of 3.1 is much bigger than the mean of paper 1, which corresponds well to the fact that meat induces more stomach acid.
Remarks
The following remarks may be of interest only to people who like to think about questions of validity of scientific research.
I can send a dozen of papers in good journals proving that the urinary alkaline tide phenomenon is legit. however, the two papers above did not appear in top journals. so can we trust these measurements? my view: Western doctors do not need ph measurements in urine to determine stomach acid secretion. they have medical devices to do that directly. so while Western researchers may publish on the phenomenon, they wont give you exact details useful for doing home measurements with ph stripes. for the same reason I dont think its very likely that a top journal would accept such research. Here come in the Indians, who did this great and useful research out of the necessity to help out their Indian colleagues, who do not have devices. all in all, I think this is an understandable situation where I do trust the measurements as being as good as it gets. the more relevant question for me is that we are lacking numbers for different and more Western meals. for example what is normal if the meal is a steak or a typical European breakfast, etc.