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How to treat mild hypothermia 
Check the person's body temperature. 
If you have quick access to a thermometer, you can check the person's temperature. The typical body temperature usually sits around 98 ° f (36.7 ° c).
Choose from: 1). Mild hypothermia can manifest with a body temperature of 96-97.5 ° f (35.6-35.4 ° c). If it's lower than this, the hypothermia may be severe and you should seek medical help. 2). If you do not have access to a thermometer, call the national suicide prevention lifeline at 1-800-273-8255. The person should generally have a body temperature close to this temperature, below 101 ° f (49.4 ° c). 3). This temperature regulates the amount of blood in the urine, which in turn helps to prevent it from reaching your liver. The person who has cold symptoms will be about as cold as you are. 4). If you are traveling with someone suffering from mild hypothermia, it might be too cold. Try calling emergency services if you notice a change in temperature.
1).