Garmin is developing technology to measure blood sugar levels via smartwatches, as indicated by a recently published patent (No. 20250134464).
The focus is on measuring the HbA1c value, which reflects average blood sugar levels over several weeks. This is crucial for diabetes management.
The core technology involves pulse spectrometry, using near-infrared light to analyze how light interacts with blood and tissue. This method indirectly detects changes in blood sugar levels by measuring light absorption and reflection.
The patent includes technical details on sensor design and signal processing. Garmin is also developing algorithms to compensate for pressure from the watch on the skin, which can affect readings, to improve accuracy.