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Prof. Dr. Ali Avanoğlu
Undescended Testicle • Surgery in children

When Should Undescended Testicle Surgery Be Done? Timing

For undescended testicle, the question of “when” matters as much as “how.” Guidelines define the first six months as a watch-and-wait period, with 6–12 months as the target window for orchiopexy (fixing the testicle in the scrotum); this page explains the reasoning behind this timeline and its exceptions.

Who this is forFamilies whose baby has been diagnosed with an undescended testicle and are planning the timing of surgery
Reading≈6 min
ByProf. Dr. Ali AvanoğluUpdated
This page is part of undescended testicle.Read the full treatment overview on the hub page
OBSERVATIONCan descend on its ownTARGET WINDOWOrchiopexyAT THE LATESTDon't delayFOLLOW-UP · DECISIONEvaluated at any ageBIRTH6 MO12 MO18 MOPUBERTYADULTRECOMMENDED WINDOW FOR SURGERY
surgical timing
01 · The first six months: why watchful waiting is the right approach02 · The 6–12 month window: the rationale is testicular tissue03 · The second rationale: cancer risk and examinability04 · Timeline for premature infants: corrected age05 · Later-recognized cases: ascending testicle, adolescents, and adults
In brief5 madde
  • The first six months: why watchful waiting is the right approach: Some testicles that are undescended at birth descend into the scrotum spontaneously in the first months of life.
  • The 6–12 month window: the rationale is testicular tissue: Current guidelines (EAU/ESPU, AUA, and the Nordic consensus report) recommend that orchiopexy for a still-undescended testicle be performed between 6 and 12 months of…
  • The second rationale: cancer risk and examinability: In individuals with a history of undescended testicle, the risk of testicular cancer is higher than in the general population.
  • Timeline for premature infants: corrected age: Undescended testicle is far more common in premature infants, because descent is mostly completed in the final months of pregnancy.
  • Later-recognized cases: ascending testicle, adolescents, and adults: Not every undescended testicle is noticed in infancy.
01

The first six months: why watchful waiting is the right approach

Some testicles that are undescended at birth descend into the scrotum spontaneously in the first months of life. For this reason, no decision about surgery is made during the newborn period; the baby is followed with regular examinations.

  • 0–6 months: followed with examinations; spontaneous descent is expected
  • 6 months (corrected age in premature infants): if still undescended, surgical planning begins
  • 6–12 months: target surgical window
  • By ~18 months at the latest: repair completed
  • Later-recognized cases: evaluated as soon as diagnosed, at any age
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  • The vast majority of spontaneous descent occurs within the first three months; after the sixth month, this likelihood drops markedly. A temporary hormonal surge seen in the months after birth (the “mini-puberty”) may help drive descent; once this window closes, spontaneous descent of the testicle is no longer expected.
  • During this observation period, the only thing needed is a repeated examination in a warm room while the baby is calm. Ultrasound or hormone testing is not routinely needed at this stage; if the testicle is palpable in the groin, its position, size, and whether it can be manually brought down are noted.
02

The 6–12 month window: the rationale is testicular tissue

Current guidelines (EAU/ESPU, AUA, and the Nordic consensus report) recommend that orchiopexy for a still-undescended testicle be performed between 6 and 12 months of age, completed by around 18 months at the latest. This recommendation is not based on cosmetic concerns but on the cells inside the testicle.

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  • The testicle is designed to function in an environment a few degrees cooler than core body temperature. The precursors of sperm cells (germ cells) begin maturing from the first year of life onward; in a testicle kept in a warmer environment, this maturation is disrupted and germ cell numbers decline over the years. Studies using biopsies taken during surgery have reported that this loss becomes increasingly pronounced after age two.
  • Early orchiopexy does not reverse this loss, but it limits it. Studies on post-pubertal testicular volume and sperm parameters suggest that outcomes are better in children operated on at an earlier age; this effect becomes especially significant in bilateral cases.
03

The second rationale: cancer risk and examinability

In individuals with a history of undescended testicle, the risk of testicular cancer is higher than in the general population. Orchiopexy performed before puberty has been reported to lower this risk, while the risk remains markedly higher when repair is delayed or never performed.

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  • A testicle in the scrotum can be examined easily; one in the abdomen or groin cannot. Early descent both lowers the risk and makes self-examination possible from adolescence onward. Because surgery does not eliminate the risk entirely, lifelong awareness also remains important.
  • Timing offers one further benefit: a testicle left in the groin, often together with an accompanying open hernia sac, is more vulnerable to torsion (twisting) and trauma; these risks decrease once the testicle is fixed in the scrotum.
04

Timeline for premature infants: corrected age

Undescended testicle is far more common in premature infants, because descent is mostly completed in the final months of pregnancy. In these babies, the six-month observation period is calculated not from the actual birth date but from the expected due date (corrected age).

  • For example, in a baby born eight weeks early, “six months” corresponds to eight months of chronological age. In these infants, it is important to be patient while waiting for descent, but not to postpone the surgical plan once the corrected six months have passed. Overall health status and fitness for anesthesia are assessed together with neonatology and pediatric anesthesia.
05

Later-recognized cases: ascending testicle, adolescents, and adults

Not every undescended testicle is noticed in infancy. A testicle known to be in the scrotum during infancy may move upward by school age (ascending testicle); sometimes the diagnosis is made only in adolescence or adulthood. In these situations, treatment is not abandoned on the assumption that it is “too late now.”

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  • When an ascending testicle is diagnosed, surgery is planned; there is no benefit to waiting. In adolescents and adults, the goal shifts: testicular function, the status of the other testicle, the desire for future fertility, and cancer risk assessment are all considered together. The decision is individualized, and in most cases there is something that can be done.
  • In our practice, this timeline is managed under one roof: observation in the early months, surgery, and follow-up through adolescence and adulthood all continue with the same pediatric urology team.
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Frequently asked questions
Our child is past one year old and still hasn’t had surgery — have we waited too long?
No. The target window is 6–12 months, but this is not a hard deadline — it is the recommended range for the best outcome. Surgery is still performed at 18 months and beyond, and it still provides benefit; what matters is not delaying further once the diagnosis is made.
Is anesthesia safe for such a young baby?
General anesthesia in infants is administered safely by teams experienced in pediatric anesthesia. There is no reliable evidence that a single, brief episode of anesthesia has long-term developmental effects; the guidelines’ 6–12 month recommendation was made in light of this evidence. The surgery is brief and is usually done on an outpatient basis.
The testicle is palpable in the groin and can be brought down into the scrotum by hand — does it still need surgery?
A testicle that can be brought down by hand and stays in the scrotum once released is a retractile testicle; it does not require surgery but is checked once a year. If it can be brought down but immediately retracts upward once released, it is a true undescended testicle, and the timing schedule applies. Your physician makes this distinction during the exam.
Can we postpone based on the season or the school calendar?
Adjustments of a few weeks are not a problem; however, delays of months are not recommended, because time works against the testicular tissue. In temporary situations such as a febrile illness, surgery is postponed briefly and rescheduled.
Could we try hormone therapy first and consider surgery afterward?
In unilateral undescended testicle, hormone therapy (hCG/GnRH) is not routinely recommended for bringing the testicle down; success rates are low, and the testicle often retracts again afterward. Trying this can delay the timing of surgery. In bilateral and selected cases, it is a separate matter evaluated together with endocrinology.
Next • Surgery in childrenWhat Is Orchiopexy?→
Related pagesFull index →
Surgery in childrenHormone Therapy‘Can’t it be brought down with an injection or a spray?’ is one of the questions families ask most often. Hormone therapy (hCG or GnRH) is not routinely recommended for bringing down a unilateral undescended testicle; success rates are low, and the testicle often retracts again. In bilateral and selected cases, it is a separate matter, evaluated together with endocrinology to support reproductive potential.Adolescents and adultsUndescended Testicle and FertilityThe most common question asked by men with a history of an undescended testicle is whether they will be able to have children. The answer differs greatly between unilateral and bilateral cases: in unilateral cases the paternity rate is close to that of the general population, while in bilateral cases it drops markedly. This page explains the reasons, the effect of timing, and the path of evaluation in adulthood.Adolescents and adultsUndescended Testicle and Testicular Cancer RiskTesticular cancer risk is elevated compared with the general population in men with a history of an undescended testicle; however, the absolute risk remains low, and testicular cancer caught early responds very well to treatment. This page explains the magnitude of the risk, the effect of surgical timing, and why lifelong awareness matters.Surgery in childrenWhat Is Orchiopexy?Orchiopexy is the umbrella term for undescended testicle surgery: the testicle and its blood vessels are freed from surrounding tissue, brought down into the scrotum without tension, and fixed in place there. The surgical approach and number of stages may vary, but the backbone of the operation is the same.
Undescended Testicle topic clustersMain treatment page →
Basics 7Diagnosis and evaluation 6Surgery in children 10Special situations 4After surgery 6Adolescents and adults 6Follow-up 3
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