No insulin was turned on. It should be stored between 2 and 8 degrees Celsius, that is, in the refrigeration room of the refrigerator. At this temperature, it maintains its biological effect and is sterile during its validity period. If you want to keep it for longer, you can put it in the freezer and thaw it later. This is wrong. For the same reason, insulin should not be checked in luggage when flying. Because even in summer, the temperature in the luggage compartment at high altitude is tens of degrees below zero, which will freeze insulin. So insulin should be put in the handbag when boarding the plane. Although insulin is liquid, the Civil Aviation Administration allows insulin to be carried with you.
Insulin in use has been turned on. It is important to distinguish between the core of an insulin pen and the bottled insulin pumped by a syringe. If the latter is the case, because the bottle mouth is sealed with rubber, after extracting insulin, it can be put back into the refrigeration room of the refrigerator. If the pen core is mounted in an insulin pen, it can not be put back into the refrigeration room after use. Because there is a needle on the core of the pen, the insulin in the bottle communicates with the outside world. When the pen connects the pen core into the refrigeration chamber, air enters the bottle because the temperature decreases and the liquid shrinks. When taken out from the refrigeration chamber, insulin in the bottle spills from the tip of the needle due to the rise of temperature, thus affecting the accuracy of dose.
Insulin does not deteriorate in the short term at room temperature because it functions at body temperature. It can be preserved for about 6 weeks at room temperature of general air conditioning (about 25 C). So the insulin pen core in use usually lasts three or four weeks, so it is safe. Sometimes insulin pens are put in pockets when they are out, near body temperature, and stored for about 4 weeks. In conclusion, insulin will not deteriorate in the short term as long as it is not exposed to very high temperatures (such as on the beach floor) or direct sunlight. When traveling outside, it is better to put it in the insulating cup or bag, and the car has air conditioning, so that it is not affected by high temperature.
