3 hours oral glucose test

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3 hours oral glucose test

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Old 06-26-2015, 13:34   #1
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Default 3 hours oral glucose test

Hi Got back my blood test result from 3 hr OGTT. In the same time as they withdrawed blood I used my glucometer to see and compare numbers. How come the numbers differ so much?

I have been diagnosed pre-diabetes 2 years ago, now that I am pregnant they wanted repeat the test and here are the results. I stopped Metformin(750mg) 1 week before the test.

Name Value Reference Range
GLUCOSE, FASTING 75 65-94 mg/dL
GLUCOSE, 1 HOUR 127 <180 mg/dL
GLUCOSE, 2 HOUR 122 <155 mg/dL
GLUCOSE, 3 HOUR 44 <140 mg/dL

How come blood withdraw test result was different from my glucometer. i just cant belive the results differ so much. The follow are results taken from glucometer
Fasting 82
1 hr 170mg/dl
2 hr 145 mg/ dl
3 hr 63 mg/dl

thank you

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Old 06-26-2015, 14:04   #2
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Meters are permitted by law to be +/- 20 % off accuracy. A more reliable instrument would be very cumbersome to carry & expensive to use. So we have to make do with the best available options. Though some meters nowadays are pretty accurate.

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Old 06-26-2015, 14:21   #3
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Could you check your meter to be sure it compensates its reading to a plasma value. Most meters do, but some of the old ones do not. If it does, see if the manufacturer might send you a new meter, this one is at edge of the 20% allowance. This is assuming that the labs meter is within its allowable variance which is narrower than ours.

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Old 06-26-2015, 14:30   #4
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Yes it is so strange, was really suprised when my blood test came back and the numbers were so off.
But do you belive the blood test taken from vein are actually the most accurate?

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Old 06-26-2015, 14:38   #5
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The figures that the lab came up with were from your arm? The figures you get from your finger are from capillaries. If that's the case they will be different.

The lab work to a standard of 5%. As the others have said, your meter allows a 20% tolerance. But they are measuring different things. Generally your vein is twenty minutes behind your capillaries so I'm sorry to say that your comparison won't work.

For instance, your one hour figure shows a spike close to the limit of acceptability. Their figure hasn't seen that yet.

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