Objective: To evaluate the efficiency for the recovery of spermatozoa using the standard technique and a technique based on ultrasound. Materials and methods: An experimental study was carried out to compare two techniques for spermatozoa recovery; (i) the standard technique, based on elution of the evidence in distilled water with a buffer and, (ii) a modified technique that included concentration by centrifugation and ultrasound. The efficiency was based on manual counting of spermatozoa using dilutions 1:1 to 1:500. Results: The modified technique substantially improved the recovery of spermatozoa. While the standard technique recovered 3.1%, the modified one resulted in a recovery of 17.5% using the 1:10 dilution, which represents a six-fold increase. The modified technique was the only one able to recover spermatozoa in dilutions higher than 1:250. Conclusion: The implementation of the ultrasonic technique improves the recovery of spermatozoa.