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The assigned content of a CRS is given in the leaflet available on our online catalogue, when it is required by the prescribed test and/or assay of the corresponding European Pharmacopoeia text. 

In other cases, values are not assigned and it cannot be assumed that the purity is 100%. 

However, the purity of an impurity CRS, can be assumed to be 100% for the test for related substances of the corresponding European Pharmacopoeia text, if the purity is not indicated.

The assigned content of lyophilised preparations may be expressed as mass of pure substance per vial (eg mg/vial) or potency per vial (eg IU units/vial).

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