article_snippet: To detect the most subtle of these changes, AdvicyDrive uses digital photoplethysmography (PPG)
article_snippet: -  an imaging test used to detect changes in blood flow at the microvascular level on the skin.
article_snippet: It's typically used to monitor blood flow in people with Raynaud's disease, for example, from example fingers and toes.
article_snippet: To detect the most subtle of changes, AdvicyDrive uses digital photoplethysmography (PPG) - an imaging test used to detect changes in blood flow at the microvascular level on the skin.
highlights_snippet: it uses digital photoplethysmography (PPG) to track changes in blood flow .
  