Type 1 Diabetes Glucose Monitoring Print Alternative Blood Sugar Testing Sites Are They Safe and Accurate? By Gary Gilles Updated October 31, 2018 Medically reviewed by Lindsey Waldman, MD, RD on November 12, 2019 Ulrike Hammerich/EyeEm/Getty Images More in Type 1 Diabetes Glucose Monitoring An alternative blood testing site is a body location other than your fingertip where you can reliably test your blood glucose. Common alternative blood testing sites include the palm, forearm, upper arm, thigh, and calf. Using alternative body sites for blood sugar testing has been a relief to many with type 1 diabetes who have suffered from chronically sore fingers from multiple tests each day. Of course, people with diabetes have been using alternative sites for years, but only recently do we have research available to show this is OK (meaning, these sites give accurate results). Also, the majority of (but not all) glucose meters are designed to support alternative testing. Before you use an alternative site, discuss it with your doctor. Read the instructions for your blood glucose meter and only use sites that are identified in the instructions. Blood Glucose Results May Vary With Alternate Sites It is important to know that blood sugar results can vary depending on when and where you test your blood. For example, if you get a sample of blood from a testing site on your thigh and your blood sugar is going up significantly at the time, you may get a delayed result. In other words, the result you receive may be what your blood sugar was 20 to 30 minutes ago but it is not accurate for the present moment. You might be able to speed up the process slightly by rubbing the area until it is warm to increase blood flow to that site. This doesn’t mean you shouldn’t use alternative test sites but they may not give an accurate result when glucose levels are apt to change rapidly, such as after a meal, after taking insulin, during exercise or when you are sick or experiencing stress. When you need an immediate, present-moment result, such as when you suspect low blood sugar, always use a finger test site. When Not to Use Alternative Site Testing There are circumstances when alternative testing is not recommended. These include: When you have just taken insulinDuring or after exerciseIf you feel you might be experiencing low blood sugarWhen you are preparing to driveWhen you are or suspect that you are illDo not use an alternative site unless you have discussed it with your doctor first and you are able to follow his recommendations.,Do not use an alternative site unless it is identified in the instructions for your blood glucose meter. Hypoglycemic Awareness Factors Into Using Alternate Sites Some people with diabetes also have difficulty sensing the bodily signals of low blood sugar. Their hypoglycemic awareness has been blunted over time and they may not be able to accurately assess when blood sugar is going low. Though blood sugar testing is the only way to know for certain whether glucose levels are dropping, alternative site testing is not recommended for people who struggle with hypoglycemic awareness. Discuss it with your doctor before you do alternate site testing. Was this page helpful? Thanks for your feedback! Sign up for our Health Tip of the Day newsletter, and receive daily tips that will help you live your healthiest life. Sign Up You're in! Thank you, {{form.email}}, for signing up. There was an error. Please try again. What are your concerns? Other Inaccurate Hard to Understand Submit Article Sources Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial policy to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Blood Glucose Testing on Fingertip, Palm, Forearm and Thigh. BD Diabetes. Blood Glucose Meters: Getting the Most Out of Your Meter. Food and Drug Administration. 08/05/2015. Continue Reading