Sperm Agglutination Test (Sperm-Specific Antibody Screen)
This test checks for antibodies in your blood that may cause sperm cells to clump together, which can affect fertility.
["Helps identify potential causes of unexplained infertility by detecting sperm-attacking antibodies."]
Key facts at a glance
- LOINC
- 33217-1
- Short code
- Sperm Agglutinated Smn Ql
- Synonyms
- Sperm Agglutinated Smn Ql
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you or your partner have trouble getting pregnant, unexplained infertility, recurrent miscarriages, or if you’ve had previous negative fertility treatments. It’s often used alongside other fertility evaluations to pinpoint issues like immune-related infertility.
How the Test Works
A small sample of your blood is mixed with sperm from your partner (or a donor sample if applicable). If antibodies are present, the sperm will clump together visibly, indicating a positive result. This reaction helps determine whether immune factors may be interfering with conception.
What to Expect Before the Test
No special preparation is needed. You may have a simple blood draw at a clinic or lab. If sperm samples are used, your partner may need to provide a fresh semen sample (collected within 2–3 hours of testing) or a frozen sample thawed on-site.
What the Results Mean
A positive result means sperm clumped together, suggesting the presence of sperm-specific antibodies. A negative result means no clumping occurred, which doesn’t rule out other fertility issues but indicates no obvious immune-related blockage. Results are qualitative (yes/no) and not tied to specific numeric ranges.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Positive sperm agglutination can indicate an autoimmune response where the body’s immune system mistakenly attacks sperm. While not all cases of infertility are caused by antibodies, this test helps identify a potential immune-related cause. If positive, further testing (like sperm antibody titers or immune workups) may be recommended to explore treatment options such as immunosuppression or assisted reproductive technologies.
Short name
Sperm Agglutination
Frequently asked questions
What does a positive result mean for fertility treatment?
Can this test be done on my own sperm sample?
How often should I get this test if I have recurrent miscarriages?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy