Scientists developed a device the size of a Band-Aid that uses a chemical stimulant to produce sweat without spending hours on a treadmill, even when the patient is relaxed and cool, which can also measure chemical markers in sweat. Such a disposal patch may potentially replace some blood tests.

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Scientists developed a device the size of a Band-Aid that uses a chemical stimulant to produce sweat without spending hours on a treadmill, even when the patient is relaxed and cool, which can also measure chemical markers in sweat. Such a disposal patch may potentially replace some blood tests.