Remember that the information presented here is not intended to replace the care of your own doctor. Before making any changes in the management of
your own illness, you should consult your physician or other qualified medical professionals.
Question
If your blood sugar is greater than 200 mg/dL [11.1 mmol/L]
at the first hour of an oral
glucose tolerance test
but not at the second hour, does this mean you have diabetes or just
impaired glucose tolerance?
When the ADA standard states "any casual test greater than 200 mg/dL [11.1 mmol/L]" is positive for diabetes does that first hour of the OGTT count as causal?
Answer
In rare circumstances, a very high reading at the one-hour mark during an OGTT might not be diabetes.
For example, there's a syndrome of "dumping" that happens in some people with abnormal stomach function
where the sugar goes right through from the stomach to the small bowel
very rapidly, which causes the one-hour GTT value to be a lot
higher than expected.
So a GTT should have more than just one high
value to nail the diagnosis.
And, no, the one-hour value doesn't count as "casual" as it occurred after a huge sugar load.
See diagnosis of diabetes
for more information.
wwq
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