Skip to content

Sperm Morphology Analysis (Sperm Midpiece Analysis)

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

This test evaluates the shape and structure of the midsection (midpiece) of sperm cells, which contains essential components like mitochondria for energy. It helps assess fertility and potential sperm function.

Quick summary

["Midpiece abnormalities may indicate underlying fertility issues or genetic factors."]

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

Key facts at a glance

LOINC
106112-6
Short code
Sperm midpiece Smn
Synonyms
Sperm midpiece 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 Is Done

Your healthcare provider may recommend this test if you or your partner are experiencing difficulty conceiving. It can also be part of a broader evaluation for unexplained infertility or when other sperm tests show concerns about sperm health.

What to Expect During the Test

A semen sample is collected and examined under a microscope to analyze the midpiece of sperm cells. This typically involves a simple urine collection at home or a lab procedure, followed by microscopic evaluation.

How Results Are Interpreted

Results focus on the proportion of sperm with normal midpiece structure, which may be compared to established reference ranges for healthy sperm. Abnormalities can signal potential fertility challenges.

Common Findings and Their Implications

Midpiece abnormalities, such as missing, irregularly shaped, or fragmented midpieces, may suggest issues like mitochondrial dysfunction, genetic disorders, or exposure to toxins that affect sperm health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for diagnosing fertility problems linked to sperm morphology. While not all abnormalities directly impact fertility, they can guide further testing or treatment options, such as assisted reproductive technologies or lifestyle adjustments.

Short name

Sperm Midpiece Morphology

Frequently asked questions

What does a sperm midpiece test measure?
It assesses the structural integrity and shape of the midsection of sperm cells, which contains critical energy-producing components. The focus is on identifying any deviations from normal morphology that may affect fertility.
How is the specimen collected for this test?
You’ll typically provide a semen sample, often at home or in a clinic, using a sterile container. This is then sent to a lab for microscopic examination of the midpiece.
Can this test alone determine if I’m infertile?
No, this test is one part of a broader fertility evaluation. Combined with other tests (like semen analysis or genetic screening), it helps pinpoint potential causes of infertility.
  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