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Type 2 “Red” Blood looking pale, leading to HIGH Glucose Error Reading?

Discussion in 'Ask A Question' started by Estragon, Dec 17, 2019.

  1. Estragon

    Estragon · Well-Known Member

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    Good morning people. OK, I’ve noticed that less than deep red Blood sample gives high reading on my Test strips. For example:

    Low “Red” Blood = 10.3
    Normal “Red” Blood = 7.4

    Is this Low Red colouration more serum/plasma than Red blood cells? Does more or the Glucose reside in the serum/plasma? If so, am I reading slightly higher Glucose than I should be? Am I innocently introducing an error?

    TIA - E
     
  2. DJC3

    DJC3 Type 2 · Expert

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    Hi Estragon yes I believe the blood glucose testing strips we use daily test plasma levels of glucose ( but the lab test HbA1c detects what is stuck to the red blood cells). I should think it might make a difference, I know my level of hydration certainly does. (Although bg tends to be lower if I’m well hydrated)
    I never see any visible difference in the blood drop from my finger pricks though, it seems a bit odd that you have such variation in the macroscopic appearance, is there a time when this is more obvious? Ie after exercise, drinking a lot of water etc?
     
  3. Mr_Pot

    Mr_Pot Type 2 · Well-Known Member

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    I am surprised you can notice different shades of blood in such small samples. Assuming you are using the normal finger prick test are you squeezing your finger hard and mixing interstitial fluid with blood?
    Washing hands in hot water should remove the need for squeezing.
    Home glucose meters measure whole blood and a mathematical correction is applied in the meter so that it reads plasma level.
     
  4. Estragon

    Estragon · Well-Known Member

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    Yup, I agree. HBAIC does the longterm effects on the Cells, which, by defintion have been replenished.

    Oh really - OK! I'll note that.

    Yeah, I only "noticed" this after I got that HIGH, unexpected result. I subsequetly re-tested, noted the palenes of the sample and registered a similar high level. Subsequently during the day my numbers reverted to my normal 7.4-ish.

    Why odd? I'm seeing this. Or "odd" that I should see this at all? Or that the placing of the Lancet? Or . . . ?

    Early days for me to comment. I do know I can get a 5.5 during the day AFTER excercise.

    Once again, seriously, thanks for your time in considering your reply.
     
  5. Estragon

    Estragon · Well-Known Member

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    It's a Curse! I make digital movie content. I'm pre-loaded with both colour references and an image memory that stuns others. As I say, it's a curse. Yeah, I'm the one that says of a Film, hmm, that's not the same shirt or her hair was lighter in that last scene or . . yah get the picture? But here, I can definatley register a kinda weakly inspid blood sample.
    Yes. I tried to squeeze hard, but the area I was squeezing on was not very productive - but I went ahead. As to the mixing, how would I know? What comes out, is what comes out? And soooo.... maybe this IS at the basis of the 10 HIGH?

    Well, I'm careful to wash in hot water and use a fresh Kitchen Towel. I hadn't known the link between the Hot and Squeezing - noted!
     
  6. Mr_Pot

    Mr_Pot Type 2 · Well-Known Member

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    Just for clarity, I meant that you should not be squeezing hard, if you do you will be mixing interstitial fluid, which is clear, in with the blood, this may be the reason you are seeing different shades.
     
    • Agree Agree x 2
  7. JohnEGreen

    JohnEGreen Other · Master

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    The colour of blood is down to how oxygenated it is highly oxygenated blood such as found in arteries is a brighter red venous blood darker.
    Also the shape of blood cells tend to change.
     
  8. Flora123

    Flora123 Type 2 · Well-Known Member

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    It’s funny as someone mentioned the sample colours a few months ago. I seem to be the opposite thought - pale red tests much lower than dark red which looks thicker and tests higher. Interesting.
     
    • Agree Agree x 1
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