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Sperm Head Morphology Assessment

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

This test evaluates the shape and size of the head of sperm cells in a semen sample to help assess male fertility.

Quick summary

["Sperm head morphology is one part of a semen analysis used to gauge sperm quality and potential fertility."]

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

Key facts at a glance

LOINC
106111-8
Short code
Sperm head Smn
Synonyms
Sperm head 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 sperm head morphology assessment looks at the shape and structure of the head of each sperm under a microscope. The head contains the genetic material, so its form can be a clue to how well the sperm may function.

Why It May Be Ordered

Your healthcare provider may order this test as part of a semen analysis when you and your partner are having trouble conceiving or when a fertility evaluation is needed. It can help identify possible causes of male factor infertility.

How the Sample Is Collected

A semen sample is usually collected privately at the clinic or laboratory, or sometimes at home following specific instructions. The sample is then examined in the lab, where technicians evaluate many sperm under a microscope.

Understanding the Results

Results describe the proportion of sperm with normally shaped heads compared with those with abnormal shapes. Your provider will interpret this alongside other semen analysis results and your overall health history. No single number tells the whole story.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Sperm Head Shape Evaluation

Frequently asked questions

Does an abnormal result mean I cannot father a child?
Not necessarily. Sperm head morphology is only one measure of sperm quality, and many people with abnormal morphology can still conceive. Your provider will consider all of your test results together.
Can I prepare for this test?
Your provider or lab will give you specific instructions, which may include avoiding ejaculation for a certain period before collecting the sample. Follow those directions closely for the most accurate results.
Will I need to repeat this test?
Sometimes. Because semen quality can vary from sample to sample, your provider may recommend repeating the analysis before drawing firm conclusions.
  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