Indications for pressure flow studies prior to surgical treatment of BPH:
(1) voided volume < 150 mL
(2) maximum flow rate > 15 mL/s
Subgroups where pressure flow studies should be considered:
(1) men < 50 years of age, or > 80 years of age
(2) postvoid residual urine volume > 300 mL
(3) suspicion for neurogenic bladder dysfunction
(4) after radical pelvic surgery
(5) previous unsuccessful invasive treatment (I am not sure if this includes TURP)
NOTE: The wording of the guidelines is a little vague. It is unclear if the indications and subgroups are independent, or if both indications and subgroup membership is required. I have assumed that they are independent.
