How severe is a blood test with the following levels:
GGT of 139
AST of 254
ALT of 281
... and what steps should be expected? Is this cirhossis?

Having a blood test usually implies that the results are sent back to the requesting doctor. The requesting doctor, after reviewing the results, will call you to have come back in and tell you the results of the test.

Have you had a chance to discuss this with your doctor?