Only in case of flat flow due to urethral stenosis. In other cases no. P. Abrams published on that topic and I suggest to read his book "Urodynamics", or the "incontinence" ICS Edition 2013.
Uroflow should not be relied upon as an "independent" predictor of successful medical management of BPE. BPE is not necessarily synonamous with BPH and may be due to inflammation or malignant neoplasm. Reduced uroflow may often be a sign of detrusor insufficiency, a common cause of failure of medical management of "BPH". Transrectal US can be helpful in evaluation of the lobar distribution of BPH and critical in demonstrating intra-vesical protrusion of prostatic growth (including median lobe). The latter has been associated with treatment response as has prostatic shape (Presumed Circle Area Ratio). US or MRI classification of lobar hyperplasia abd correlation with symptoms, signs, and treatment response is also in early stages of research.
Article Benign Prostatic Hyperplasia: A Review and Ultrasound Classification
Article Use of MRI for Lobar Classification of Benign Prostatic Hype...