After completing a review of the Galaxy S5, South Korea's health agency officially proclaimed that the Galaxy S5, which features a heart rate sensor, doesn't fall into the “medical equipment” category. This is actually a good thing for consumers, because it means that the SGS 5 won't risk missing its release date due to the thorough testing that medical devices go through. However, some recent rumours claim that Samsung might be having a different headache with supplying components on time.
The South Korean agency stated that the Galaxy S5 is, technically, still a medical device, but it doesn't fall into the category under current law. Thus, the ministry plans revisit the law as to differentiate between heart rate sensors made specifically for medical usage, and those made for sport and other leisure activities.
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source: G for Games