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Sperm Breakage Index (SBI) via Tail Fragmentation Analysis

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

This test evaluates the structural integrity of sperm tails, which can affect fertility. Damaged sperm tails may impair sperm motility and ability to fertilize an egg.

Quick summary

["Assessing sperm tail damage helps identify potential fertility issues."]

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

Key facts at a glance

LOINC
61184-8
Short code
Sperm broken tail NFr Smn
Synonyms
Sperm broken tail NFr 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

Why This Test Matters for Fertility

Sperm tail damage can occur due to oxidative stress, genetic factors, or exposure to toxins. Healthy sperm tails are essential for proper sperm movement and penetration into the egg. This test helps determine if structural abnormalities might affect fertility.

How the Test Works

A sample of sperm is examined under a microscope to count the proportion of sperm with broken or fragmented tails. This is often part of a broader sperm analysis to assess overall sperm quality.

What to Expect Before the Test

You may need to provide a semen sample, often collected through masturbation after abstaining from ejaculation for 2–5 days. Your healthcare provider will guide you on proper collection techniques.

Possible Causes of Abnormal Results

High levels of sperm tail fragmentation may suggest underlying issues like oxidative stress, genetic disorders, or exposure to environmental toxins. It can also be a marker of poor sperm quality in men with unexplained infertility.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Sperm Tail Fragmentation Test

Frequently asked questions

What does a high sperm tail fragmentation result mean?
A high result suggests that a significant portion of your sperm may have structural damage to their tails, which could reduce their ability to move effectively and fertilize an egg. This may require further investigation or treatment options.
Can lifestyle changes improve sperm tail integrity?
Yes, certain lifestyle changes such as reducing exposure to toxins, managing stress, maintaining a healthy diet, and avoiding smoking or excessive alcohol may support sperm health. Consult your healthcare provider for personalized advice.
Is this test covered by insurance?
Coverage depends on your insurance plan and reason for testing. If this test is part of fertility evaluation, check with your provider or insurance company to confirm coverage details.
  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