It seems like it would be 951,000 IU/mL. I am not sure why the term copies (usually expressed per milliliter) is even mentioned.
Also, I thought I read in an old post once that the "Hf" after the number stands for a High flag relative to the the 43 units. That could be 100% totally wrong so one of the reasons I posted is to bump this post so a more experienced member could respond.
Hi Mari: My vote is 951,000. Regards, GB