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Quote from "The SAGES Manual of Pediatric Minimally Invasive Surgery" by Danielle S. Walsh, Todd A. Ponsky, Nicholas E. Bruns -
"In cases where there is bilateral non-palpable UDT, a human chorionic gonadotropin (HCG) simulation test is helpful to determine if there is any functioning testicular tissue [1]. On occasion, full descent will be noted after HCG, allowing the clinician to arrive at the diagnosis of retractile testes. While the testicles will recede as the hormonal stimulation dissipates, the condition will correct itself at puberty."
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