An ice-pack testing device (Figure 6.10) is used to test conditioned ice-packs to verify that they are capable of preventing the freez ing of freeze-sensitive vaccines when kept in cold storage. The device has a plastic bowl of ice-water with a thermometer that shows the temperature of the room. Conditioned ice-packs are placed in the bowl of the device and the time it takes for the room temperature to reach the temperature of the tip of the thermometer is measured. The device ensures that ice-packing turns into water and that the water in the bowl quickly reaches the same temperature as the center of the bowl. If the room temperature is lower than the melting point of the ice-pack and the time is longer than 45 minutes it has not lost its ability to protect the vaccines. If it is shorter than 45 minutes it has not lost significant ability to protect the vaccines. If it is longer than 1 minute and less than 3 hours it will not have lost significant protection. It is important to check the icepacks once a month.
Kids don't always wait until the last minute to make a vaccine appointment so the vaccine-to-dose ratio can be variable. In the event the person selecting the vaccine dose may not have the exact amount of vaccine, a de-bulb is the device of choice. If the person who receives the vaccine has the correct amount of vaccine (full vaccine), the vaccine is shaken in a plastic bag and then placed back in the fridge. A de-bulb is a white cap placed over the vaccine to dis-guise it from the person looking through the liquid for the correct amount of vaccine. The de-bulb will only cover one-third to two-thirds of the glass tube. If a de-bulb is used, the entire tube of vaccine must be shaken well.