Association Between Qmax/eGFR Ratio and LUTS Severity in Men Over 40

Inclusion Criteria: * Male patients aged 40 years or older presenting with lower urinary tract symptoms (LUTS) * Able to provide informed consent * Willing and able to undergo uroflowmetry and blood testing * Able to complete the IPSS questionnaire, including the QoL item * Estimated glomerular filtration rate (eGFR) ≥ 30 mL/min/1.73m² Exclusion Criteria: * History of urological surgery (e.g., prostatectomy, bladder surgery) * Diagnosed or suspected prostate cancer * Active urinary tract infection (based on clinical symptoms or urinalysis) * Neurological conditions affecting bladder function (e.g., Parkinson's disease, spinal cord injury) * Presence of an indwelling urinary catheter at enrollment * eGFR \< 30 mL/min/1.73m² * Inability to perform uroflowmetry or complete clinical evaluations