Egg Collection and Storage

The collection and storage of eggs, medically known as oocyte cryopreservation, is a multi-step process that involves stimulating the ovaries to produce multiple eggs, retrieving these eggs, and then freezing them for future use. Here’s a detailed overview of the process:

Ovarian Stimulation

  1. Hormonal Stimulation: The process typically begins with a course of hormonal medications to stimulate the ovaries to produce multiple eggs. This usually involves daily injections of fertility drugs (like follicle-stimulating hormone and luteinizing hormone) for about 10-14 days.
  2. Monitoring: During this period, the person undergoes regular monitoring, which includes blood tests and ultrasound exams. These tests help track the development of the follicles (the sacs in the ovaries where eggs mature) and determine the optimal time for egg retrieval.

Egg Retrieval

  1. Procedure: Egg retrieval is a minor surgical procedure, usually performed under sedation or general anesthesia. Using ultrasound guidance, a needle is inserted through the vaginal wall and into the ovaries. The eggs are then gently aspirated (sucked out) from the follicles.
  2. Duration: The procedure typically takes about 20-30 minutes, and patients can usually go home the same day, although they will need someone to drive them due to the anesthesia.

Egg Assessment

  1. Evaluation: After retrieval, the eggs are evaluated in the laboratory to determine their maturity and quality. Only mature eggs can be successfully frozen and used in the future.

Freezing (Cryopreservation)

  1. Vitrification: The mature eggs are then frozen using a rapid freezing process called vitrification. This process involves high concentrations of cryoprotectants and ultra-rapid cooling, which prevents the formation of ice crystals that could damage the egg.
  2. Storage: The vitrified eggs are stored in liquid nitrogen tanks at temperatures around -196°C (-320.8°F). They can remain frozen for many years without significant deterioration in quality.

Using the Stored Eggs

When the individual decides to use the stored eggs, they are thawed, fertilized with sperm in a laboratory (through a process called In Vitro Fertilization or IVF), and the resulting embryos are implanted in the uterus.


  • Physical and Emotional Impact: The process can be physically demanding and emotionally challenging. Side effects from the medications may include bloating, mood swings, and discomfort.
  • Success Rates: The success rates of using frozen eggs depend on various factors, including the person’s age at the time of freezing and the number of eggs retrieved.
  • Legal and Administrative Aspects: There are consent forms and legal paperwork involved, outlining the terms of use, storage, and disposal of the eggs.
  • Cost: Egg freezing can be expensive, with costs encompassing hormonal medications, the retrieval procedure, and storage fees.

It is crucial for anyone considering egg freezing to consult with fertility specialists to fully understand the process, success rates, potential risks, and costs involved. This process should be carried out at a certified fertility clinic to ensure the highest standards of safety and efficacy.

Updated on January 12, 2024

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