Screening involves:- 
Screening patients with no existing nephrostomy tube present : 
 Nasal swab.  Perineum swab.  Sample of urine. 
 Screening patients with existing nephrostomy tube in situ who are scheduled for replacement tube : 
The patient requires a FULL MRSA screen including: 
 Sample of urine from existing nephrostomy tube (see page 10 referring to this procedure). 
  Swab existing nephrostomy site. 
  Nasal swab. 
  Perineum swab.