Skip to content

Sperm Rapid Freezing Resistance Measurement (Sperm Cryotolerance Assessment)

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

This test evaluates how well your sperm survives freezing and thawing, which is important for fertility treatments like cryopreservation.

Quick summary

["Assessing sperm survival helps ensure better outcomes when storing sperm for future use."]

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

Key facts at a glance

LOINC
10624-5
Short code
Sperm Rapid NFr Smn
Synonyms
Sperm Rapid 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 Treatments

Freezing sperm is a common practice for fertility preservation, but not all sperm survive the process. This test measures how resilient your sperm are under freezing conditions, which can impact the success of procedures like IVF or sperm donation.

How the Test Works

A small sample of your sperm is frozen rapidly and then thawed. The test checks whether the sperm remains viable (able to fertilize an egg) after this process. This is typically done using specialized equipment and microscopic evaluation.

What to Expect Before the Test

No special preparation is needed. You’ll provide a semen sample, similar to a standard fertility evaluation. The test is quick and painless, and results are usually available within a few days.

What the Results Mean

Results indicate your sperm’s ability to survive freezing. High survival rates suggest good cryotolerance, while lower rates may indicate potential challenges with sperm storage or future fertility procedures.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Sperm Freezing Resistance Test

Frequently asked questions

What causes sperm to lose viability during freezing?
Sperm viability loss during freezing can be influenced by factors such as sperm motility, concentration, and genetic or environmental stressors. If your results show poor survival, your doctor may recommend additional fertility assessments or discuss alternative storage methods.
Can this test be used for both male and female fertility?
No, this test specifically evaluates sperm resilience and is used primarily in male fertility evaluations, particularly for sperm cryopreservation. It does not assess female fertility directly.
How often should I get this test?
This test is typically ordered as part of a fertility evaluation or before sperm storage. If you’re undergoing fertility treatments, your doctor may recommend it periodically to monitor sperm quality over time.
  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