Torsion testis diagnosed is confirmed by?

Diagnosis of torsion testis is confirmed by Doppler ultrasound scan(colour doppler). By this, the absence of blood supply (testicular aery ) to the affected testis is confirmed. But performing this test may squander vital minutes. If there is any doubt about the diagnosis, scrotum should be explored without any delay Reference : page 1380 Bailey and Love's sho practice of surgery 25th edition