You only got a drug test, one with a split sample. The "A" sample should have 30 cc's or ml's in it. 15 cc's are used for immunoassay and then if a non negative result is received, the last 15 cc's gets GC/MS. The second vial is the "B" sample, 15 or 30 cc's. If you get a positive and want to pay for a retest, this is what they use. I think it will go straight to GC/MS in the case you want to pay for a retest, which is easier said than done.