Extended Custom Variables
Extended custom variables are only available to Google Analytics Premium Accounts.
Custom variables aren't available for Universal Analytics. If you're using Universal Analytics, use custom dimensions instead. Learn more about custom dimensions or visit the Custom Dimensions & Metrics feature reference in our Developer Guides for more technical information.
Each property in a standard Google Analytics account can create up to five custom variables. Premium Accounts can extend the number of custom variables to a total of 50 per property. This allows any tracking requests over the 2K limit to be sent via HTTP POST instead of GET. When requests are sent via POST, the size of the POST request is limited to 8K.
The following limits apply to CVs:
Each property must be enabled for CVs
Extended custom variables are only available within Premium Google Analytics accounts. You must also make sure that the property you want to use for extended custom variables is also enabled for Premium. Contact your representative for more information, or learn more about Premium Analytics.
Viewing Custom variables in reports
Cookie data limitations
Tracking a large number of custom variables could impact your site performance due to the extra data being transferred to Google Analytics with each page request. While this impact will likely be minor, sites with strict performance standards should be aware of this possibility.