


A vial of insulin is a combination of insulin hormone and a sterile liquid, called the diluent. The concentration of the insulin to the diluent determines its strength. Though U100 insulin is the most common, insulin may be ordered in a variety of strengths, such as U40. The "U" value of insulin indicates its strength  the number reflects the number of active insulin units in each mL of liquid. You could think of 100 "units" as 100 tiny pieces of insulin floating in each mL of diluent. U100 will have 100 units per mL, and U40 has 40 units per mL. This means that U100 has 2.5 times the amount of active insulin per mL, therefore 2.5 times as strong. Appropriate syringes are made for use with the respective insulin, marked with the correct measure for dosage. We strongly recommend that you use matching insulin and syringes. However, it is possible to use the below conversion chart to convert from U40 to U100 or U100 to U40 effortlessly. Simply find the amount that you need to use and find the appropriate conversion in the adjacent column. Before deciding to use nonmatching equipment, make sure you understand the concepts of dilution and units per volume  it is very important for understanding the actual amount of insulin your cat receives. When talking to your vet, make sure you're telling him the actual amount insulin you're giving. As an example, let us say you use U40 insulin in a U100 syringe and administer shots at the 10 unit mark. Don't get confused and tell your vet you're dosing at 10 units  because of the dilution, you're really only giving 4 units of insulin. Printfriendly version of this chart



