Being that I am very familiar with the process of most sites that were doing IV, some had the IV lock inserted before Yom Kipur, others had a non Jew establish the line on Yom Kipur.
No one had a Yid establish the line on Yom Kippur, most poskim hold that creating IV access is a ???????? and any patient that is sick enough that requires IV should probably not be fasting.
Getting flashback while creating IV confirms IV placement so its not really a mekalkel.