Home OGTT test vs results from one year ago

[hose1975]

Hi everyone,

So, two insulin-dependent cases of gestational diabetes along seem to have started me well and truly down the path towards full-blown diabetes.

My postnatal OGTT results from this time last year were as follows:

Fasting 4.7, one hour 5.7, two hours 6.4.

Obviously done under lab conditions.

I did a home version of the OGTT this morning and these are the results:

Fasting 6.0, one hour 9.0, two hours 5.3.

Am I right to be concerned about the first two numbers? That seems like a big jump in the fasting numbers in a year. I know that this wasn't under lab conditions but I calibrated my blood glucose monitor prior to starting.

Bizarrely, at 3.5 hours after I was hypoglycemic (3.7) with proper symptoms which came out of nowhere: sweaty, shaky, pale. It felt like it did when my fast-acting insulin kept working even after my breakfast had gone from my system in my last pregnancy.

So the question is what the hell is going on? Anybody know?

Cheers

Jo

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[whompa73]

Fasting level of 6 is upper of ok but still fine . After 2 hours 7.8 or below is considered normal 7.9 to 11 is considered impaired 11.1 or over is considered diabetic. I wiuld also ask if you washed hands as if traces of glucose on them it will give fals readings . I would also have done a couple of tests just to make sure I wasnt getting a rouge result . I would however surjest that its probably given the results worth going having a test at the drs.

 

[phoenix]

You aren't testing the same sort of blood (one is venous and not oxygenated, the is other is capilliary and oxygenated) .The results may not be comparable.
This doctor explains the difference
http://www.diabetesofficevisit.com/2011 ... erent.html

Though he says 5%, there are lots of studies, with varying results, some find a bigger differences than others. They do seem to agree that there is only a relatively small difference when fasting but at the hour test when glucose is circulating quickly it can be much bigger. (fingerstick higher at this point) However, differences may vary a lot between individuals.

Unfortunately, empirical conversion factors have been applied to generate equivalent glucose values for different blood sample compartments without adequate data to show equivalence. One such conversion is that fingerstick capillary blood has a glucose concentration that is 7-8% higher than the concurrently drawn venous concentration[11]. Others have presented charts showing the equivalence of venous and capillary glucose levels that differ between 0% to 13% depending on the glucose level[12]. The validity of these conversion factors has been called into question since individual differences between capillary and venous blood glucose values are too great to allow for a meaningful transformation to be applied

http://www.bestthinking.com/articles/me ... nous-blood

So you don't really know if there was a big difference from your previous lab test results. I think though that you should go and discuss it with your doctor. If you've had GD twice it must surely be important to keep an eye on things.