Lucas had a urine sample drawn through a needle/syringe. I don't think it bothered him all that much. It is really just an injection of sorts. Having a thermometer shoved up one's butt would be much more stressful! After all, it needs to stay in place for several moments and wiggling around makes it difficult to keep in. All they will do is hold her in a laying down position, feel for the right area, and insert the needle.

Prayers that all goes well.