In this article:
To understand the causes of low semen volume, how blocked ducts can affect male fertility, and the available diagnosis and treatment options, we spoke with Dr Shikha Malik, Fertility Specialist at Nova IVF Fertility.
What Are Ejaculatory Ducts?
Ejaculatory ducts are small tubes in the male reproductive system that carry sperm and fluid from the seminal vesicles into the urethra, the tube through which semen leaves the body.Sperm are produced in the testicles, while the seminal vesicles and prostate contribute most of the fluid that forms semen. If the ejaculatory ducts become blocked, sperm and semen may not pass through normally.
What Is Ejaculatory Duct Obstruction?
Ejaculatory duct obstruction (EDO) occurs when one or both ejaculatory ducts become partially or completely blocked. This can prevent sperm from entering the semen and may reduce the amount of fluid released during ejaculation.A complete blockage affecting both ducts may result in very low semen volume and no sperm in the ejaculate. A partial blockage may allow some sperm and fluid to pass through.
What Causes Ejaculatory Duct Obstruction?
Several conditions can cause a blockage in the ejaculatory ducts, including:- Congenital abnormalities: Some men are born with ducts that are absent, narrowed, or abnormally formed.
- Cysts: Cysts near the prostate or reproductive ducts may compress or block the passage.
- Infections or inflammation: Inflammation of the prostate or nearby reproductive structures can sometimes lead to scarring.
- Scar tissue: Previous surgery or injury in the pelvic or urinary tract may cause narrowing.
- Stones or calcification: Small stones or calcium deposits may obstruct the ducts.
What Are the Symptoms of Ejaculatory Duct Obstruction?
Some men do not notice symptoms until they undergo fertility testing.Others may experience:
- Lower-than-usual semen volume
- Difficulty conceiving
- Pain during or after ejaculation
- Blood in the semen
- Discomfort around the prostate or pelvis
- Very low sperm count or no sperm in the semen
How Is Ejaculatory Duct Obstruction Diagnosed?
A urologist or male fertility specialist may recommend the following tests:- Semen analysis: Measures semen volume and evaluates sperm count, movement, and other characteristics. The test may need to be repeated to confirm an abnormal result.
- Transrectal ultrasound (TRUS): Uses ultrasound to examine the prostate, seminal vesicles, and nearby ducts for possible blockages, cysts, or enlargement.
- Pelvic MRI: May provide more detailed images when ultrasound findings are unclear or additional assessment is needed.
- Hormone tests: Blood tests may check testosterone and other reproductive hormones to assess testicular function.
Can Ejaculatory Duct Obstruction Be Treated?
Yes. Treatment depends on the blockage's location and severity, symptoms, and fertility goals.- Transurethral resection of the ejaculatory ducts (TURED): A surgeon passes a small instrument through the urethra to open the blocked ducts and allow semen to flow more normally.
- Seminal vesiculoscopy: In selected cases, a surgeon uses a small endoscope to examine and treat blockages in the seminal vesicles or nearby ducts.
- Sperm retrieval and assisted reproduction: If surgery is unsuitable or unsuccessful, sperm may sometimes be collected directly from the reproductive tract for use in IVF with intracytoplasmic sperm injection (ICSI).
Can Ejaculatory Duct Obstruction Affect Fertility?
Yes. A blockage may prevent sperm from entering the semen, making natural conception difficult. The effect depends on whether the obstruction is partial or complete and whether one or both ducts are affected.Low semen volume does not always mean a man is infertile. However, it is important to identify the underlying cause, as certain conditions can affect semen production and male reproductive health. A proper medical evaluation can help determine the cause and guide appropriate treatment.
When Should You See a Doctor?
Consult a urologist or fertility specialist if you notice:- Persistently low semen volume
- Difficulty conceiving
- Repeated semen analysis results showing very low sperm counts or no sperm
- Pain during ejaculation
- Blood in the semen, particularly if it recurs
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FAQs on Low Semen Volume: How Blocked Ducts Can Affect Male Fertility
- Does low semen volume always mean a blocked ejaculatory duct?
No. Low semen volume can have several causes, including incomplete sample collection, hormonal problems, retrograde ejaculation, and certain medications. Testing helps identify the cause. - Can sperm production remain normal with ejaculatory duct obstruction?
Yes. The testicles may continue producing sperm even when a blockage prevents sperm from entering the semen. - Can ejaculatory duct obstruction return after surgery?
A blockage may persist or recur because of scarring or other complications. Follow-up testing can help determine whether treatment has restored semen flow.