In suspected testicular torsion, color Doppler ultrasound finding that supports diagnosis is:

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Twisting of the spermatic cord in testicular torsion abruptly cuts off arterial blood supply to the testis. On color Doppler ultrasound, this most reliably shows as decreased or absent intratesticular arterial flow, which strongly supports the diagnosis. Venous flow is often affected as well, but the key clue is reduced arterial color signal. In contrast, inflammatory conditions like epididymo-orchitis produce increased blood flow due to hyperemia, and a normal flow pattern does not rule out torsion early on. Venous thrombosis isn’t the typical Doppler pattern here. So, decreased arterial flow is the best finding to support torsion and triggers urgent management.