That seems to be Luke's preference. Matthew and Paul use different words. You and xzins implied that all three use the same word. Lue's choice is indeterminete. Matthew's and Paul's is very specific. But they are not the same words.
"That seems to be Luke's preference"
Well, he's the doctor so he probably is the most accurate in describing her condition just like he is in describing the physical condition of Jesus on the cross.