Exactly same HBA1C test result over 4 months

[paul.a.thompson]

I've had exactly the same HBA1C result of 55.2 mmol/mol for the last 3 tests over a 4 month period. This seems unlikely has anyone had this happen to them. Particularly as I stopped taking Gliclazide in this period.

 

[JITR]

Statistically it's possible but unlikely. I would raise it with your GPs, or whoever requested the tests, and ask for another one.

 

[paul.a.thompson]

Statistically it's possible but unlikely. I would raise it with your GPs, or whoever requested the tests, and ask for another one.

Hi thanks, I've raised with GP and they've agreed a re-test next week. In talking to them they clearly believe that the results are correct rather than something is wrong with the process. Statistically I think the probability of having the same 55.2 mmol/mol result on 7th March, 6th May and 5th Jun is if not zero is pretty close.

 

[Leadinglights]

Hi thanks, I've raised with GP and they've agreed a re-test next week. In talking to them they clearly believe that the results are correct rather than something is wrong with the process. Statistically I think the probability of having the same 55.2 mmol/mol result on 7th March, 6th May and 5th Jun is if not zero is pretty close.

HbA1C is not normally quoted with a decimal point in the result, the test is not that accurate. But whether you would expect the same result in tests that are so close together depends on what you have been doing.
Your march test would be covering Dec, Jan and Feb, the May test covering Feb, March, April and the June test March, April and May so a fair bit of overlap. It is normal to have at least a 3 month gap between tests to reflect changes made.

 

[everydayupsanddowns]

It’s quite unusual to have repeated HbA1c checks so close together because of the ‘overlap’ @leading lights describes.

Some of the reds blood cells from previous tests will still be in circulation during the later results, so a degree of similarity between the HbA1cs is almost to be expected.

HbA1c is slightly ‘weighted’ towards recent weeks, but one of its strengths is that is captures a wider (less immediate) picture.

It’s more common to have HbA1c checks spaced 3-6 months apart 🙂

 

[Docb]

Hi thanks, I've raised with GP and they've agreed a re-test next week. In talking to them they clearly believe that the results are correct rather than something is wrong with the process. Statistically I think the probability of having the same 55.2 mmol/mol result on 7th March, 6th May and 5th Jun is if not zero is pretty close.

The odds of getting three identical credible results results are low but somewhere in amongst all those millions being tested, it will happen to somebody. Could be you are that somebody.

In statistics its called the lottery effect.....the odds of winning the lottery are incredibly low but if you can sell enough tickets, somewhere somebody body will win it.

 

[rebrascora]

Like @Leadinglights I have not had an HbA1c quoted to a decimal place either, always a whole number. Were these NHS tests or private? It seems very odd indeed both to have 3 HbA1c results quoted to a decimal place as well as them all being identical. If NHS, are you getting them from the NHS app or has the doctor told you the results?

 

[JITR]

A possibility is the tests came out as HbA1c percentages around 7.0% and then converted as such to mmol/mol.