I’ve seen those test doses where the patient has some numbness in the feet a minute after a 3ml 1.5% Lido with Epi test dose. It’s not convincing and their vitals are fine. Then you lay them down, skip the loading dose because of the equivocal test dose, start the pump, and 10 minutes later they are numb up to their nipples and can’t move their legs. I can’t explain why this happens, but it can. A colleague of mine had as two instances of this happening to the point that they had to mask ventilate. I’d like to attribute it to just impatience on their part had I not see a positive test dose take a long time to declare itself.