Most useful investigation for VVF
High-Yield Explanation
Big fistula Fistula tract is available Obvious escape of urine Tiny fistula Dye test Knee chest position: Escape of bubbles on coughing Three-swab test Gold Standard Cystoscopy Ref: D.C.DUTTA&;S TEXTBOOK OF GYNAECOLOGY; 6th edition; Pg no: 420