The SAP note 1651862 - Release planning for Microsoft SQL Server 2012 is self-explanatory and as recommended you should update the SP level of the system to the recommended patch level or above. More information is available in the SAP note 1676665 - Setting up Microsoft SQL Server 2012. Tx SICK or the Consistency Check will not throw out any information related to the recommended SP level of the system.
Cheers
RB