Fertility challenges are often discussed as if they are primarily a female issue, which does a disservice to the many couples for whom male factor is a significant or contributing part of the picture. In approximately half of couples experiencing infertility, a male factor is identified as contributing. In many of those cases, it is the primary cause. Yet male infertility remains underdiagnosed and underaddressed, in part because the conversation is too rarely started early enough.
Understanding male infertility, what causes it, how it is diagnosed, and what the treatment options look like is an essential part of the evaluation for any couple trying to conceive. At Hanabusa IVF, male factor evaluation is integrated into the initial workup, not treated as an afterthought.
How Male Fertility Is Assessed
The foundation of male fertility evaluation is the semen analysis, a laboratory test that measures sperm count, motility (movement), morphology (shape), volume, and pH. A semen analysis gives the first meaningful picture of sperm function and is one of the least invasive, most informative tests in the fertility workup. It should be among the first tests done when a couple seeks evaluation, alongside the female partner's assessment.
A single semen analysis may not tell the full story, since sperm parameters can vary from sample to sample. A second analysis, typically done two to four weeks after the first, may be recommended to confirm results. Additional testing, such as sperm DNA fragmentation analysis or hormonal evaluation, may be warranted depending on what the initial semen analysis shows.
Types of Male Factor Infertility
Low Sperm Count (Oligospermia)
Oligospermia refers to a sperm concentration below the normal reference range. Mild oligospermia involves a moderate reduction in count; severe oligospermia involves very low numbers. The lower the count, the more likely that fertility treatment requiring assisted fertilization will be needed.
Poor Motility (Asthenospermia)
Even with adequate numbers, sperm that do not move normally cannot effectively reach and fertilize an egg. Poor motility, either total motility or the proportion of sperm with progressive forward movement, is a common male factor finding that affects both natural conception and IUI success rates.
Abnormal Morphology (Teratospermia)
Morphology refers to the shape of the sperm. Strict morphology criteria (Kruger morphology) assess what proportion of sperm have normal head, midpiece, and tail structure. Low normal morphology is common and, in isolation, has a complex relationship with fertility outcomes. Severely abnormal morphology may indicate problems with sperm function beyond what appearance alone reveals.
Azoospermia (No Sperm)
Azoospermia, the complete absence of sperm in the ejaculate, occurs in a small percentage of men with infertility. It can be obstructive (sperm are produced but blocked from exiting) or non-obstructive (production is impaired or absent). Evaluation of azoospermia requires hormonal testing and often a urological consultation. In some cases of obstructive azoospermia, surgical sperm retrieval procedures can obtain sperm for use in IVF with ICSI.
Sperm DNA Fragmentation
Standard semen analysis does not assess the integrity of the DNA within each sperm. High levels of sperm DNA fragmentation, damage to the genetic material the sperm carries, can result in fertilization failures, poor embryo development, and higher miscarriage rates even when standard semen parameters appear normal. DNA fragmentation testing is an important adjunct for couples with unexplained infertility, recurrent pregnancy loss, or poor embryo quality in IVF cycles.
"One of the most important changes in how I approach male factor evaluation is that I now routinely discuss sperm DNA fragmentation testing much earlier. It catches things standard semen analysis misses, and it changes the treatment plan in meaningful ways when it is elevated."
— Dr. Lyndon Chang, Medical Director at Hanabusa IVF
Causes of Male Factor Infertility
Male factor infertility can result from a wide range of causes:
- Varicocele: Enlarged veins in the scrotum that increase testicular temperature and impair sperm production, the most surgically correctable cause of male infertility
- Hormonal imbalances: Low testosterone, elevated FSH or LH, or hormonal disorders affecting the hypothalamic-pituitary-testicular axis
- Genetic factors: Y-chromosome microdeletions, Klinefelter syndrome, or other chromosomal abnormalities affecting sperm production
- Prior infections: Certain sexually transmitted infections or mumps orchitis can permanently damage testicular function
- Lifestyle factors: Smoking, heavy alcohol use, heat exposure, anabolic steroid use, and certain medications can significantly impair sperm quality
- Idiopathic: In many cases, no specific cause is identified despite thorough evaluation.
Treatment Options by Severity
Lifestyle Modification
For mild male factor findings, lifestyle changes, stopping smoking, reducing alcohol, addressing heat exposure, and optimizing nutritional health can meaningfully improve sperm parameters over several months. Sperm take approximately 72 to 90 days to mature from stem cells to ejaculate, so changes in habits take time to manifest in semen analysis results.
IUI (Intrauterine Insemination)
For couples with mild male factor infertility, IUI involves processing a sperm sample to concentrate motile sperm and placing them directly into the uterine cavity around the time of ovulation. IUI reduces the distance sperm must travel and improves the concentration of available sperm at the site of fertilization. It is most appropriate when the count and motility issues are mild, and there are no significant female factor barriers.
IVF with Conventional Insemination
For more significant male factor, IVF can bypass many of the barriers natural conception faces. Eggs are retrieved and placed in a dish with processed sperm, allowing fertilization to occur in a controlled environment.
IVF with ICSI (Intracytoplasmic Sperm Injection)
ICSI involves the direct injection of a single sperm into each mature egg. It is the treatment of choice for severe male factor infertility, including very low counts, poor motility, very abnormal morphology, elevated DNA fragmentation, or when prior IVF fertilization rates were poor. ICSI does not require the sperm to be motile or capable of penetrating the egg independently, making it effective even in cases that would previously have been considered untreatable.
"ICSI has genuinely changed what is possible for couples with severe male factor. A decade ago, some of these couples had no viable path to biological parenthood. Today, even with very challenging sperm parameters, there is often a meaningful option."
— Dr. Diana LeBlanc, a Fertility Specialist at Hanabusa IVF
Frequently Asked Questions
What does a low sperm count mean for fertility?
Low sperm count reduces but does not eliminate the probability of natural conception. Mild reductions can be addressed with IUI; more significant reductions typically require IVF with ICSI. The specific count, combined with motility and morphology, shapes the treatment recommendation.
Can male infertility be treated?
Many forms of male infertility can be meaningfully improved or managed. Varicocele repair, hormonal treatment, lifestyle modification, and assisted reproductive technologies (IUI, IVF, ICSI) address the full spectrum from mild to severe male factor. Even men with very few or no sperm in the ejaculate may have options through surgical sperm retrieval.
What is sperm DNA fragmentation and does it matter?
Sperm DNA fragmentation refers to breaks or damage in the DNA carried by sperm. Elevated fragmentation is associated with fertilization failure, poor embryo quality, and higher miscarriage rates. Standard semen analysis does not measure it; a separate DNA fragmentation test is needed. It is worth evaluating in couples with unexplained infertility, recurrent pregnancy loss, or poor IVF outcomes despite good female parameters.
How long does it take to improve sperm quality?
Because sperm take approximately 72 to 90 days to fully mature, lifestyle changes or treatments affecting sperm production typically take at least three months to show improvement in semen analysis results. Patience and consistency matter in the interim period.
Does Hanabusa IVF evaluate the male partner?
Yes. Male infertility evaluation is a standard part of the fertility workup at Hanabusa IVF. Both partners are evaluated from the start, because understanding the full picture, including sperm parameters, shapes the most efficient treatment path.
Male Factor Is Half the Picture
Addressing male infertility early, thoroughly, and honestly is not just a courtesy to the male partner; it is how you get the most accurate diagnosis and the most effective treatment plan. At Hanabusa IVF, both partners matter from the first visit, and male factor evaluation is treated with the same care and individualization as every other aspect of the workup.
If you are beginning a fertility evaluation or have received male factor results that need to be interpreted, a consultation at Hanabusa IVF can help you understand what the findings mean and what the path forward looks like.
