LDR can also mean "labor delivery recovery" room. It's a room in a birthing facility where the pregnant woman can finish her labor, push out the baby, and spend the rest of her hospital stay. The LDR room is advantageous to the mother-to-be, as she will not be carted to different rooms while she is trying to birth her child. I imagine it carries some disadvantages to the medical staff, as all delivery/post-delivery equipment (such as a baby warmer, resuscitation equipment, etc.) would need to be in each room, rather than having just a few rooms with the medical supplies.