when i asked for tests, i asked for the works...so, there could be a routine collection of tissue for testing. that's all a biopsy is, so i wouldn't be worried unless you get a phone call after. even then it may not be life-threatening, but just something that you need to know before you get the letter with the results.
Sciatica, L3-4 Tear, Spinal Stenosis, DDD L3-S1
Fusion (BMP) L4-5 '11
Anterior Fusion (BMP) L3-S1 '13