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The reference standard label and the reference standard catalogue (heading “Unit quantity” heading) declare the  total amount  of material (active substance and excipients, if any) which that has been filled in filled in each vial or ampoule as ; this information is requested required by the customs authorities. This quantity is declared circa (“ca”declared is an approximate figure (’ca’), so this quantity is it should not to be considered accurate from an analytical point of viewperspective.

Where appropriate, and especially in the case of substances used for titration or assay, the expression of content or potency is mentioned in the leaflet, which states the amount of active substance or the activity/potency expressed in IU or Ph. Eur. Units. This information is also available in the reference standard catalogue database under the heading “Assigned content”‘Assigned content’.