There is Apps that allows checking your blood pressure, such as:
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High Blood Pressure Symptoms,
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Perf. Blood Pressure (BP) Monitor,
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Blood Pressure (My Heart),
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IBP Blood Pressure,
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Health Tracker Pro…
There is also smartphone accessories that help monitor your health, such as:
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AliveCor Heart Monitor,
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iBGStar Blood Glucose Monitoring system,
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Scanadu Scout…
you can check this link for more accessories and details: http://allthingsd.com/20130703/house-call-five-smartphone-accessories-that-help-monitor-your-health/