Fertility preservation: the decision to freeze, made well

Fertility preservation – the cryopreservation of eggs, sperm, or embryos for later use – is sometimes a medical necessity and sometimes a deliberate choice. It is one of the few areas in fertility care where time is genuinely on your side, but only if you start while there is time to use.

Two distinct categories

Medical preservation is for patients about to undergo treatment that will damage fertility: chemotherapy, pelvic radiation, certain surgeries, transition hormones in transgender patients. The goal is to bank gametes before they are lost. The clock is short and the decision is forced. Elective preservation is for patients who are not yet ready to conceive but want to protect future options. The clock is more flexible, but biology still applies: eggs frozen at 30 will be more useful in 5 years than eggs frozen at 38.

Egg freezing: what the data actually says

Eggs frozen by vitrification before age 35 thaw with greater than 90 percent survival in good labs. Each thawed egg has roughly a 4 to 7 percent chance of becoming a live birth, age-dependent. To have a 70 percent cumulative chance of one live birth, women under 35 typically need 15 to 20 frozen eggs; over 38, that number rises to 30 plus.

Sperm freezing

Technically simpler and more durable. Frozen sperm survives indefinitely with no significant loss in fertilising potential. A single sample is enough for many future ICSI cycles. The case for sperm preservation is strongest before chemotherapy or radiation, but elective banking has a place for some patients too.

Embryo freezing

The most efficient form of preservation when both partners are committed and known. Embryos created through IVF and frozen for later transfer have the highest live-birth rates of any preservation option, because the gametes have already cleared the fertilisation step. Limited to couples who are willing to lock in their gametes together at the time of freeze.

The cost of waiting

Egg freezing in your early thirties typically yields more eggs per cycle and higher live-birth probability per egg than freezing in your late thirties. A typical Indian centre quotes Rs 1.5 to 2.5 lakh per cycle, plus 10 to 25 thousand annually for storage. Most patients need two cycles to bank enough eggs.

Questions worth asking your doctor

• Given my age and AMH, how many cycles am I likely to need to bank a meaningful number of eggs?
• What is your clinic’s vitrification thaw survival rate?
• What is the realistic per-egg live-birth probability when I come back to use them?
• How long can I store, and what is the annual storage cost?
• If I am freezing for medical reasons, how soon do we need to start?

This essay is educational. Every patient’s situation is different – the right plan is shaped in conversation with a fertility specialist who knows the full picture.