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The assigned content of a CRS is given in the leaflet available on our online catalogue, when it is When 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%. 
Ph. Eur. text, the content assigned a CRS is given in the leaflet available in the Ph. Eur. reference standards database.

For impurity CRSs used for quantification in the related substances test of the corresponding Ph. Eur. monograph, the content 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.
, unless otherwise indicated in the leaflet.

In all other cases, no value is assigned and no assumption can be made on the purity or content of the CRSThe 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).