Glucose Levels: Understanding Blood Glucose vs. Sensor Glucose

Understand the relationship between blood glucose and sensor glucose when it comes to reading glucose levels. Learn why there’s a lag between blood glucose and sensor glucose readings and how different activities such as eating and exercise can affect these numbers.

Sensor glucose (SG) is the glucose level in the interstitial fluid and blood glucose (BG) is the glucose level in the blood. A Continuous Glucose Monitors (CGMs) measures glucose in the interstitial fluid and a Blood Glucose Meters (BGM) measures the glucose in the blood(1).

BGMs and CGMs are both safe ways to measure your glucose levels, but readings may not match because they each measure glucose from different sources. Glucose enters the bloodstream first which results in a lag time between the BGM value and the CGM value(1).

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(*) Eligible patients will receive one (1) FreeStyle Libre 2 sensor for users with a compatible mobile phone operating system at $0 copay. The expiration date of the voucher is 60 days from the issue date. This program is available for patients with Type 1, Type 2, or gestational diabetes. Patients ages 18 and older are eligible to sign up and receive an offer for the (1) FreeStyle Libre 2 sensor. Patients ages 4-17 are eligible to receive an offer for the (1) FreeStyle Libre 2 sensor through their parent or guardian. This offer is void where prohibited by law. Abbott may modify or rescind this offer at any time without notice. The discounts are not available to beneficiaries of Kaiser Permanente, Medicare, Medicaid or other federal or state healthcare programs, residents of Massachusetts, or US territories (other than Puerto Rico). The free (1) FreeStyle Libre 2 sensor is provided as a sample and is limited to one sample per eligible person per product identification number. The FreeStyle Libre 2 sensor cannot be re-sold, traded nor submitted to any third-party payer for reimbursement and is not provided as any inducement for future purchases. The free sample card is not health insurance.

1. Cengiz, Eda, and William V Tamborlane. “A Tale of Two Compartments: Interstitial Versus Blood Glucose Monitoring.” Diabetes Technology & Therapeutics 11, Suppl 1 (June 2009): S11-6. doi:10.1089/dia.2009.0002.

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