This is indeed inexplicable.

[mysorian]

I have been trying to regulate glucose in the blood for many years. 99% of the time the tests to determine glucose were pin-pricks and the strip or on blood that was drawn in a doctor's office and later analyzed in the laboratory. Recently I have tried CGM.

During lunch, I tried to:
1. start off with a tbsp of apple cider vinegar in three-fourths cup of water
2. Some 20 minutes later had lunch (31 grams of Fox-tail millet rice with rasam (Indian-style soup), 51 grams of cooked Mung beans, 25 grams of avocado, cucumber, and onion salad in olive oil), 1 tbsp of yogurt).
3. 1 tbsp of apple cider vinegar.

After two hours I measured 194 mg/dL of glucose in the blood with a one-touch strip.

This was indeed surprising and turbo-charged my skepticism. Apple cider vinegar should not have raised my blood. But all the other ingredients that I eat most days do not raise my glucose level to exceed 140 after two hours.

Can anyone make sense?

 

[EllieM]

After two hours I measured 194 mg/dL of glucose in the blood with a one-touch strip.

Assuming the strip is from a glucometer then I would do a second test if the result was much higher than expected. Glucometers just aren't that accurate.

 

[mysorian]

What is the confidence level in glucometer measurements? One more prick means more pain, will it be 10% or 20% less?

 

[KennyA]

Every glucometer is supposed to work to a given tolerance, callen the acceptable error or something similar.

If I recall correctly (I don't have my reference book with me) for the UK this is no more than 5% error, 95% of the time. In other words 19 out of 20 readings will be within 5% of the true blood glucose value. A true value of 100mg/dl could therefore (for the 19 of 20) produce a result of anything from 95 to 105.

If you normally and consistently get around 140mg/dl from that meal, then it starts to look like a rogue 1-in-20 result.

I would usually either immediately restest with a result like that, or ignore it. Generally I don't test for very familiar foods because the result will usually be exactly the same as many times before, or a rogue result. Neither adds much to knowledge.

 

[mysorian]

I ignore this outlier. Do you often get 'Rogue results'? If so, that 95% of the times nor more than 5% is in danger.