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Semen Volume and Sperm Concentration with 1-Hour Post-Ejaculation Analysis (for Fertility Evaluation)

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

This test measures key factors in your semen, including volume and sperm count, after ejaculation. It helps assess fertility and identify potential issues affecting sperm quality.

Quick summary

["Understanding your semen health can help determine fertility status or uncover reproductive concerns."]

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

Key facts at a glance

LOINC
51934-8
Short code
Sperm Slow 1h p ejac NFr Smn
Synonyms
Sperm Slow 1h p ejac 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

What This Test Measures

Your semen sample is analyzed for **volume** (amount of semen released) and **sperm concentration** (number of sperm cells per milliliter). This test is often part of a broader fertility evaluation, especially if you’re struggling to conceive.

Why It’s Done

Doctors may recommend this test if you’re experiencing difficulty getting pregnant, have unexplained infertility, or if you have known conditions that could affect sperm production or function, such as low testosterone or hormonal imbalances.

Sample Collection and Preparation

You’ll provide a semen sample after sexual stimulation (typically within 1–2 hours of ejaculation). The sample is then examined under a microscope to count sperm cells and assess their motility (movement) and morphology (shape).

What to Expect During the Test

No special preparation is needed, but avoid ejaculation for 2–3 days before testing. The test itself is quick, and results are used to guide further medical evaluation if needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Semen Analysis (Post-Ejaculation)

Frequently asked questions

How can semen analysis help my health?
Semen analysis can reveal issues like low sperm count, poor sperm motility, or abnormal sperm shape, which may indicate underlying health problems (e.g., hormonal imbalances, genetic conditions, or infections). It also helps track fertility progress or assess the effectiveness of treatments.
What do abnormal results mean?
Abnormal results may signal fertility challenges, but they don’t always point to a single cause. Your doctor may recommend additional tests (e.g., hormone levels, genetic screening, or further semen analysis) to identify the root issue.
Can lifestyle changes improve sperm quality?
Yes! Maintaining a healthy weight, avoiding smoking, limiting alcohol, and managing stress may support sperm health. Certain medications (e.g., for prostate conditions) or environmental exposures (e.g., heat from tight clothing) can also impact sperm quality—discuss these with your provider.
  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