Do you think it is safe to proceed with your planned dose in the following situation?
You are going to do a second dose of bupivacaine through an epidural catheter for a woman in labor whose first epidural is starting to wear off. You aspirate the epidural catheter and get about 0.5 ml of a clear fluid. You mix the fluid with STP and find no precipitation.
A. No, this is CSF. Catheter has migrated and I must change my dose B. This most likely just the bit of fluid left in catheter after my last injection. Ok to proceed. C. Not enough information to make a safe judgement.