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Why is blood sugar more accurate with blood obtained by venipuncture?

1 doctor weighed in
Dr. Vance Harris
Family Medicine

In brief: Tissue fluid

Blood from a vein in direct measuring of blood.
A finger stick is blood mixed with fluid from the tissue which has a lower blood sugar in it. Be careful not to squeeze as it will give you more tissue fluid and less blood resulting in a lower than real blood sugar value.

In brief: Tissue fluid

Blood from a vein in direct measuring of blood.
A finger stick is blood mixed with fluid from the tissue which has a lower blood sugar in it. Be careful not to squeeze as it will give you more tissue fluid and less blood resulting in a lower than real blood sugar value.
Dr. Vance Harris
Dr. Vance Harris
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