we are using Immulite TSI test

Hi,

International Units (IU) stands for a unit commonly used to measure vitamins, vaccines and meds. The volume or mass that stands for a IU depends on the concentration of potency of the substance, so there is not a universal way to c​a​l​c​u​l​a​t​e​.​

Check the manufacturers information on the label of your antibody vial. For example on the vial of TNF alpha (that we have in our lab) there will be a total number of units/vial. Also it should indicate the number of units/mg of TNF. If you know the volume then it is a simple calculation to convert into units/ml. i.e. Vial of TNF (1mg) = 50,000 units/mg Volume of liquid = 1ml Therefore your stock solution = 1mg/ml or 1ug/ul or 50,000u/ml or 50u/ul

I hope this helps

Hi Malgorzata,

you can use following online calculator to do so:

https://www.etoolsage.com/converter/IU_Converter.asp?Cate=2&Substance=2011&Meas1=IU&Meas2=milligram&selectUnit=1&Result=.100000001+milligram+%28s%29

Best wishes

Stöpa