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Blood monitoring watches, like continuous glucose monitors (CGMs), measure glucose levels in interstitial fluid (just under the skin), not directly in the blood. These readings can lag behind actual blood glucose levels, especially after eating, exercising, or taking insulin. For accuracy, you may need to confirm results Show Full Answer

Blood monitoring watches, like continuous glucose monitors (CGMs), measure glucose levels in interstitial fluid (just under the skin), not directly in the blood. These readings can lag behind actual blood glucose levels, especially after eating, exercising, or taking insulin. For accuracy, you may need to confirm results with a traditional finger-stick blood test. Always consult your doctor about the reliability of your device.

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