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 |