The self-monitoring device must track at least two of which biomarkers?

• A. Only blood glucose
• B. At least two of the following: Body weight/mass, Activity and steps, Heart rate variability, Sleep duration, quality, & regularity
• C. Only heart rate variability
• D. Only sleep duration

Answer: (B)

In WELL standards, self-monitoring should capture more than one biomarker to provide a meaningful view of health. The requirement is to track at least two metrics from a defined set: body weight/mass, activity and steps, heart rate variability, and sleep duration, quality, and regularity. Blood glucose alone isn’t part of that set, so focusing on a single biomarker wouldn’t meet the rule. Tracking two or more across these categories gives a fuller picture of how different aspects of lifestyle and physiology interact, helping occupants notice patterns and make informed decisions. Examples include monitoring steps and sleep, or body weight and HRV, as long as two of the listed biomarker areas are tracked.