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: Sperm Morphology

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

: A semen analysis test that evaluates the shape (morphology) of sperm under a microscope to help assess male fertility.

Quick summary

[": Sperm morphology looks at the physical shape of sperm as one part of a fertility evaluation."]

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

Key facts at a glance

LOINC
48812-2
Short code
Sperm morph Pnl Smn
Synonyms
Sperm morph Pnl 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

: This test examines a semen sample under a microscope to assess the shape and structure of sperm. A specialist typically reviews a stained sample and categorizes sperm by how closely they resemble normal forms, focusing on the head, midpiece, and tail.

: Why It Is Ordered

: Sperm morphology is usually ordered as part of a broader semen analysis when a couple is having difficulty conceiving or when a healthcare provider is evaluating male fertility. It can also be part of a general workup for reproductive concerns.

: How the Sample Is Collected

: A semen sample is collected, usually at home or at the clinic, following instructions from your provider (often after a period of abstinence). The sample is then processed and examined in the laboratory. Follow the collection instructions carefully, since timing and completeness can affect results.

: Understanding Your Results

: Results are reported as the proportion of sperm with normal shape compared with the total examined. Your provider interprets this number alongside other semen analysis measures, such as sperm count and motility. A single result does not define fertility, and reference thresholds vary by laboratory and method.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

: Sperm morphology provides information about sperm structure that can contribute to fertility assessment, but it is only one component of a semen analysis. Abnormal morphology alone does not determine fertility outcomes, and results should always be interpreted by a healthcare provider in the context of the full clinical picture and other tests.

Short name

: Sperm Shape Assessment

Frequently asked questions

: Does abnormal sperm morphology mean I cannot have children?
: Not necessarily. Many people with lower normal-shape percentages still conceive. Morphology is one factor among many, and your provider will interpret it together with other semen analysis results and your overall health.
: Do I need to fast or prepare for this test?
: Fasting is not typically required. Your provider will give you specific instructions, often including a recommended period of abstinence before collecting the sample, so follow those directions closely.
: Can one abnormal result be trusted?
: A single result may not reflect your typical semen quality, and providers sometimes repeat the test. Discuss any concerns with your healthcare provider, who can explain whether repeat testing or additional evaluation is appropriate.
  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