While setting up lactated ringers bag I accidentally poked it with needle causing small leak, if I tape the hole can I still use it? Thanks
No, you have compromised the contents. Tape is not going to make a seal that will keep the contents sterile.
I am assuming the needle was new and sterile.
I am assuming a brand new bag, that was just removed from it's outer container.
In this case and if an emergency I might use it for the one IV/Sub Q dose that I was trying to deliver when I accidentally poked the bag. But I would throw it out and get new supplies for the next treatment.
If either the Bag or Needle were not brand new at the time of the accident, I would not even consider it for emergency use. Excepting life or death, which this would not be if there is time to look online for an answer.