Here drop should be MORE than 50% na?

here drop should be MORE than 50% na?

It is minor wording difference. The option can be understood as value falls to lesser than half the maximum pre-operative value in 10 mins. If the PTH value at 10 minutes post-gland-excision decreases >50 percent from the pre-skin-incision level, the procedure can be stopped without further neck exploration or visualization of the remaining parathyroid glands.

Thank you.