Problem: The nurse is preparing a client for an upcoming lumbar puncture (LP). What information would the nurse include in her instructions about the procedure? Need Online Tutoring? Select all that apply. The child will need to remain quiet in bed for at least 1 hour following the LP. The LP will be quite painful when the doctor sticks the needle in the child's back. An LP usually takes about 45 minutes to complete. The child will feel something cold on his back when the doctor cleans it off. The child has to be still during the procedure and the nurse will help with this.