I know patients want to get as much density as possible in a single session. However, every person has a limited amount of donor hair and most cannot afford to waste any. So would you rather have 50 FU's per sq cm and get 47 survive or place 70 FU's per sq cm and get 54 survive. Keep in mind that the situation you are in did not occur over night and often cannot be fixed over night. That does not mean that if you have a large area of hair loss you cannot try to get a lot of grafts in a single session, but in many cases additional sessions will be requested to obtain more density.