How can I tell if my external drive is formated to GUID?

Just swopping an SSD for my HDD in a mid 2009 macbook pro. I want to boot up from the ssd while it is still external via USB to save the bother of fitting it and finding it doesn't work. I've cloned the hdd to ssd with carbon copy cloner succesfully but when I hold option down while booting up the ssd is not an option. I'm worried that I didn't check that the ssd was formated to GUID at the very beginning of the process and that this might be the problem. Is there a way of finding how the ssd is formated?

Choose Utilities from the Finder’s Go menu, open the Disk Utility, click on the drive in the sidebar, and look at the Partition Map Scheme.
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for the life of me figure it out. I'm in System
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How can I tell if my external drive is formated to GUID?

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