Whilst what hanadr says is basically correct, please be aware of the following.
An extract from a Bg momitor instructions booklet.
Note on Alternative Site Testing:
Some blood glucose meters can use blood samples from the upper arm, forearm, base of the thumb, or thigh.Using alternative sites gives you more options.
Be aware that blood glucose levels from these sites may not always be as accurate as readings from the fingertips. Alternative site results differ from fingertip results when glucose levels are changing rapidly such as after a meal, after taking insulin, during exercise, or when you are ill or under stress.
Use blood from a fingertip rather than an alternative site if:
• you think your blood glucose is low,
• you don't regularly have symptoms when your blood glucose is low, or
• how you feel doesn’t match the results from the alternative site.
Caution: Not all meters can use blood from alternative sites, and not all alternative sites are
the same. Only test from sites that are identified in the instructions. Alternative site testing is
not for everyone.
Talk with your doctor before you test from a site other than your fingertip.
Ken.