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Sperm Attachment Sites (Quantitative)

Published: August 9, 2026Updated: August 16, 2026

This test measures the number of specific attachment sites on sperm cells that may influence fertility. It helps assess how well sperm can bind to the egg during fertilization.

Quick summary

["This test evaluates sperm function related to egg attachment, a key step in conception."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
106109-2
Short code
Sperm attach site Smn
Synonyms
Sperm attach site Smn
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

What This Test Measures

The test quantifies the presence and density of attachment sites on sperm cells. These sites are proteins or receptors that allow sperm to bind to the outer layer of the egg. The results help determine whether sperm have normal functional capacity for fertilization.

Why It Might Be Ordered

Your healthcare provider may recommend this test if you or your partner have unexplained infertility, recurrent miscarriages, or if previous fertility treatments (like IVF) have not been successful. It can also be part of a broader evaluation for male infertility.

How the Test Works

Sperm samples are collected and analyzed under a microscope. Special staining techniques highlight the attachment sites on sperm cells. The test counts how many sites are present per sperm and their distribution, which can be compared to expected standards for healthy sperm.

Preparation and Sample Collection

No special preparation is needed. A semen sample is collected through masturbation or by catheter, similar to a standard semen analysis. The sample is then processed in the lab for testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Sperm Attachment Sites Test

Frequently asked questions

What does a low or high attachment site count mean?
A low count of attachment sites may indicate sperm with impaired ability to bind to the egg, which could reduce fertility chances. A high count might be normal, but further evaluation could be needed to rule out other factors affecting fertility.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on lab processing times. Follow-up with your healthcare provider will help interpret the results in the context of your overall fertility assessment.
Is this test covered by insurance?
Coverage depends on your insurance plan and the reason for testing. Check with your provider or insurance company to confirm if this test is included as part of your fertility evaluation.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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