Leading Embryo Freezing in San Francisco  

Why Consider Embryo Freezing?

Embryo freezing gives you control over the timing of parenthood without compromising your fertility potential. By preserving fertilized embryos at their healthiest stage, you protect your ability to build a family on your own timeline, whether that’s next year or a decade from now.

People choose embryo cryopreservation for several practical reasons:

Egg Freezing vs. Embryo Freezing

Both options preserve your fertility, but they serve different needs depending on where you are in life and family planning. The key distinction comes down to one decision: do you want to fertilize now or later?

Here’s how the two compare at a glance:

• Egg Freezing: Preserves unfertilized eggs, giving you flexibility to choose a partner or sperm source later. Best for people who aren’t ready to commit to fertilization or want to keep all reproductive options open. Survival rates after thawing are strong but slightly lower than those of embryos. You also can’t test eggs for chromosomal abnormalities before they are fertilized.
• Embryo Freezing: Preserves fertilized embryos, which have higher thaw survival rates. Best for couples building a family together or individuals using donor sperm who are ready to create embryos now.

The right choice depends on your relationship status, timeline, and long-term goals. Our San Francisco team walks you through the medical and personal factors during your consultation, so you can decide which approach fits your situation with confidence.

Our Embryo Freezing Process in San Francisco

Our embryo freezing process in San Francisco follows a proven, step-by-step approach designed to maximize embryo quality and survival rates.

Your embryo freezing timeline in San Francisco typically spans about 5–6 weeks, from your first visit to embryo storage. Our team guides you through every phase with clarity and support. Each stage is carefully monitored to give your embryos the best possible foundation for success.

Initial Consultation and Fertility Assessment 

Your embryo-freezing journey begins with a comprehensive consultation at our San Francisco clinic, where we review your medical history, fertility goals, and any prior treatment experiences.

Our physicians conduct hormone testing, ultrasound assessments, and ovarian reserve evaluation to understand your baseline fertility status and design a personalized stimulation protocol. Once testing is complete, we order medications and schedule your cycle start date to align with your menstrual cycle.

This initial meeting allows us to answer your questions about the process, timeline, costs, and success rates specific to your situation. We want you to feel informed and confident before taking the next step.

Ovarian Stimulation and Monitoring

Once your treatment plan is established, you’ll begin daily hormone injections designed to stimulate your ovaries to produce multiple mature eggs in a single cycle. These medications are self-administered at home, and our nursing team provides detailed instruction and ongoing support throughout the process.

You’ll visit our San Francisco clinic every 2–3 days for ultrasound monitoring and blood work to track follicle development and hormone levels. These appointments typically take 15–20 minutes and can be scheduled early in the morning to accommodate work schedules.

This frequent monitoring allows us to adjust medication dosages in real time, optimizing your response and timing your egg retrieval for peak maturity.

Egg Retrieval Procedure 

The egg retrieval is a minor surgical procedure performed under light sedation in our San Francisco clinic. Both egg-freezing and embryo-freezing patients go through the same steps. Using ultrasound guidance, your physician gently aspirates mature eggs from your ovaries through a thin needle.

The entire procedure takes about 20–30 minutes, and you’ll rest in our recovery area before going home the same day. After retrieval, your eggs are immediately taken to our on-site laboratory, where our embryology team evaluates their maturity and quality.

Fertilization and Embryo Creation

On the day of your egg retrieval, mature eggs are fertilized using sperm from a partner or donor sperm through either conventional insemination or ICSI (intracytoplasmic sperm injection). For patients using donor eggs, fertilization occurs at the time of retrieval or after thawing the frozen eggs.

Our embryologists carefully monitor the fertilization process, checking each egg 16–18 hours later to confirm successful fertilization.

Fertilized eggs become embryos and begin their development. At this stage, the embryos are single-celled zygotes that will rapidly divide over the coming days. Our team in San Francisco tracks each embryo individually, documenting its developmental progress at specific time points.

Embryo Development and Culture 

Your embryos are cultured in our laboratory system that replicates the atmospheric conditions of the fallopian tubes and uterus at each developmental stage. This technology provides embryos with an optimal environment for healthy growth, improving overall quality and viability.

Embryos develop in the lab for 3–6 days, progressing from the cleavage stage (day 3) to the blastocyst stage (day 5 or 6). Blastocyst-stage embryos have higher implantation and survival rates after thawing.

If you’re planning genetic testing (PGT), biopsies are performed at the blastocyst stage before freezing.

Vitrification and Secure Storage

When embryos reach the optimal developmental stage, our embryology team uses vitrification (ultra-rapid freezing) to cryopreserve them. This advanced technique replaces the water inside embryo cells with cryoprotective agents, then flash-freezes the embryos in liquid nitrogen at -196°C in less than one second. This process prevents ice crystal formation, which could damage delicate cellular structures.

Your frozen embryos are stored in our secure, continuously monitored cryostorage facility with 24/7 temperature tracking and backup systems. Embryos remain viable indefinitely. You’ll receive a report detailing embryo development, freezing results, and, if selected, genetic testing outcomes.