https://techcrunch.com/2018/09/11/alivecor-gets-a-green-light-from-fda-to-screen-for-dangerously-high-potassium-levels-in-the-blood/

The U.S. Food and Drug Administration has granted AliveCor the designation of ‘breakthrough device’ for it’s ability to detect a rare but dangerous blood condition called hyperkalemia without taking any blood from the patient.

Hyperkalemia is a medical term describing elevated potassium levels in the blood and is usually found in those with kidney disease. The correct amount of potassium is critical for the function of nerve and muscles in the body, including your heart muscle. A blood potassium level higher than than 6.0 mmol/L can be dangerous and usually requires immediate treatment, according to the Mayo Clinic.