I have a Frigidaire oven, model PLEB30T8CCB, that does not heats up. I followed some instructions I found regarding testing the "BAKE ELEMENT," for continuity (part #67), and found out the continuity to be 18.1 ohms. Does this mean the element is bad, and need replacement? 
Are there other tests I should be doing?
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=PLEB30T8CCB
Here is the tech sheet
http://manuals.frigidaire.com/prodinfo_pdf/Lassomption/318046110.pdf
the "BAKE ELEMENT," for continuity, and found out the continuity to be 18.1 ohms. Does this mean the element is bad, and need replacement?
Spec looks like it should be 19.2 ohms but this is never an exact type measurement, so I would say your element is OK.
Are there other tests I should be doing?
If neither element comes on I would check the thermal circuit breaker.