Normally, an adult at rest should have respirations that:.

12 to 20 breaths per minute

Explanation:

According to most medical practitioners, an adult (someone from the ages of 18 upwards) at rest should normally have between 12 to 20 breaths per minute.

Note, the respirations refer to the number of breaths (in and out) a person takes per minute (60 seconds). Hence, if the respirations are lower than 12 or over 25 breaths per minute, it is considered abnormal.

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