The principle investigations are

Investigation Symptoms Possible diagnosis
Uroflow Frequency, nocturia, poor flow Bladder outlet obstruction
Pressure flow Frequency, nocturia, poor flow Bladder outlet obstruction
Cystometry Frequency, urgency Detrusor instability
Urethral closure pressure Incontinence Genuine stress incontinence
Ambulatory urodynamics Frequency, urgency pointing to unstable bladder but not shown on staticurodynamics Detrusor instability, Genuine stress incontinence

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