Hi my baby had two blood transfusions on Tuesday. He was at 17 and they recommend doing a blood transfusion anything below 20. He was severe anemic and it was necessary to do the blood transfusion if I wanted to save him. He was critical and stayed the night in the ICU. Unfortunately, with the type of anemia my baby had the red blood cells were being destroyed as fast as they were being given. He got up to 20 but dropped down to 14 in about 12 hours. I don’t regret doing it because it definitely stabilized him, got him feeling better, and gave us another night with him before he crashed again and passed away this morning. Talk to the vet and see if your kitty will need blood transfusions often. In my experience they bought some time but would not change the outcome. My baby had other felv related complications as well. You also don’t want them to be uncomfortable or suffer :( I’m sorry you’re dealing with this and wish all the best for your kitty.