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Real members of DiabetesTeam have posted questions and answers that support our community guidelines, and should not be taken as medical advice. Looking for the latest medically reviewed content by doctors and experts? Visit our resource section.
November 23, 2025
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DiabetesTeam

Why do glucose readings differ between fingers?

It's completely normal to see different glucose readings when testing different fingers. The main reason is blood flow variation. Your dominant hand typically has better circulation than your non-dominant hand, which can lead to slightly different readings.

Other factors that Show Full Answer

Why do glucose readings differ between fingers?

It's completely normal to see different glucose readings when testing different fingers. The main reason is blood flow variation. Your dominant hand typically has better circulation than your non-dominant hand, which can lead to slightly different readings.

Other factors that can cause differences include:

* Blood flow variations between fingers
* How well you washed and dried your hands
* The quality of the blood sample (squeezing too hard can mix tissue fluid with blood)
* Temperature of your hands (cold hands reduce blood flow)

A 22-point difference like yours (138 vs 160) can happen due to these normal variations. To get more consistent readings, try warming your hands before testing and let the blood flow naturally without squeezing your finger too hard.

If you consistently see large differences or readings that don't match how you feel, it's worth checking with your doctor to make sure your meter is working properly.

November 23, 2025
A DiabetesTeam Member

@A DiabetesTeam Member

Good morning Geralyn

It’s very easy for me as I don’t have to choose.
I cannot get a drop of blood out of my dominant right hand, so I always use my left hand, which produces a strong flow of blood.
I haven’t ever tested 2 different fingers on the same hand, at the same time, but Henry @A DiabetesTeam Member has experience in this and has advised that one could even receive different readings from different blood drops in the same finger.
Wishing you a very pleasant day 🤗

November 24, 2025 (edited)
A DiabetesTeam Member

It is even different in different blood drops in the same finger.

November 23, 2025
A DiabetesTeam Member

@A DiabetesTeam Member I'm curious about many things, Geralyn. I choose not to focus on the ins and outs of my condition. I try not to make diabetes an avocation. I'm stuck with it. That's enough. I do my best with my diet and exercise and the rest is out of my hands which is good because it gives me the rest of the time to focus on the positive things in life.

November 23, 2025
A DiabetesTeam Member

Learned that it depends upon one's circulation. The dominant side's blood flows better so the GL are "lower" on that side. I think you have it backwards. Could be wrong but my body shows the exact opposite of what you say.

November 23, 2025

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