How to choose and use devices to track your health.

Thousands of heart patients or people at risk of cardiovascular disease are running do-it-yourself diagnostic tests at home. Often with the push of a single button, they trigger devices smaller than a laptop computer to check their blood pressure or analyze a drop of blood for signs of recovery or risk.

Cleveland Clinic physicians applaud the home-testing trend. But they caution that for heart health — just as for home improvement — it pays to know how much you can do on your own, and when to ask for professional help. …

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