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The IVF Fertility Blog

How Sperm Freezing Preserves Fertility for Men

egg-fertilization.jpgFor many decades, sperm freezing (cryopreservation) has been established as the optimal method of preserving a man’s future fertility. At New Hope Fertility Center, sperm freezing is accomplished:

  • Discreetly
  • Easily
  • Quickly
  • Cost-effectively

Future Fertility Treatment Methods

Cryopreserved through the vitrification method in vials, thawed sperm can be readily used to fertilize a woman’s egg in the future through:

  • Intrauterine Insemination (IUI) – a highly concentrated amount of sperm is inserted into a woman’s cervix via catheter during her ovulation window
  • In Vitro Fertilization (IVF) – one sperm is directly injected into a woman’s egg in vitro through Intracytoplasmic Sperm Injection (ICSI)

Vitrification Method of Freezing Sperm

New Hope Fertility Center’s founder and medical director – Dr. John Zhang – pioneered the modern freezing method of vitrification. Used by our fertility specialists since 2004, vitrification is an advanced technique designed to increase the chance of a successful pregnancy being achieved using frozen/thawed sperm. Vitrification is the rapid freeze method of freezing. Extreme, rapid freezing avoids the formation of harmful ice crystals between a sperm’s cells. The vitrification method increases the chances of pregnancy.

How Vitrification Works

Preparing sperm sample for rapid freezing via vitrification entails:

  • Placement of the sperm in a high concentration of cryoprotectant solution while at room temperature
  • The sperm being directly plunged into liquid nitrogen to immediately drop the temperature in a large number of degrees
  • Implementing an extreme rapid rate of thawing to prevent damage to sperm cells

Flash-Freezing of Sperm

Vitrification is a flash-freezing method preventing the formation of ice crystals between a sperm’s cells. Ice crystals can cause damage.

  • 6°F (37°C) to 320°F (-196°C) temperature drop instantaneously
  • Sperm cells are dehydrated prior to freezing
  • Protectants are used to help remove surplus water between cell formations
  • Harmful ice crystals are prevented from forming between sperm cells
  • 99% survival rate
  • Safely restores cell back to its original state

Candidates for Sperm Freezing

  • Men about to undergo cancer treatment – chemotherapy or radiation
  • Men about to undergo surgery risking the health of their reproductive system
  • Men having occupations involving a high-risk of injury to their reproductive organs – example, anticipated military deployment for combat service
  • Men who are about to undergo a vasectomy procedure but want to preserve their fertility should their life circumstances change
  • Men having low sperm quality and/or quality
  • Men who are unable to produce a semen sample on demand when undergoing fertility treatment
  • Men wanting to postpone fatherhood into the future and not risk an unexpected pregnancy

Semen Analysis

A computer assisted semen analysis is a simple – yet sophisticated – diagnostic test used to detect male factor infertility. A semen sample is collected through masturbation and analyzed for sperm quality.

  • Sperm Concentration – This is the number of sperm in the ejaculate.
  • Sperm Motility – This is the percentage of sperm moving and the qualities of movement such as speed and straightness.
  • Sperm Morphology – This is the percentage of sperm having a normal appearance in size and shape.


The most effective treatment for male factor infertility is In Vitro Fertilization (IVF) using the intricate fertilization procedure known as Intracytoplasmic Sperm Injection (ICSI). ICSI is an enhanced fertilization method that can be implemented using either the known male partner’s sperm or donor sperm.

ICSI Enhances Egg Fertilization

ICSI is used during IVF to individually fertilize each egg for optimal results. ICSI is used to maximize the rate of fertilization and lessen the chances of the sperm not being able to penetrate the wall of the egg.

  • After the semen sample has been prepared, a single sperm is picked up into a tiny glass pipette under the guidance of a microscope
  • The sperm is injected directly into an egg by passing the pipette through the surface of the egg
  • The sperm cell is released into the egg and the pipette is withdrawn

Celebrated Sperm Freezing

It is important to work with a fertility care team having the experience required to design a customized fertility preservation treatment plan meeting your personal needs. To schedule your initial consultation with one of the celebrated sperm freezing experts at New Hope Fertility Center – click the icon below or call 917.525.5496.

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