What Is Traditional Surrogacy? (And How It Differs From Gestational)

If you've started reading about surrogacy, you've probably run into two terms that sound similar but mean very different things: traditional surrogacy and gestational surrogacy. The difference comes down to one question — whose egg is used — and that single fact changes everything about the medical process, the legal process, and the emotional experience. Here's a clear breakdown.

Traditional Surrogacy, Defined

In traditional surrogacy, the surrogate uses her own egg. That means she is the biological mother of the child she carries. Conception is usually achieved through intrauterine insemination (IUI) rather than a full IVF cycle, using sperm from an intended parent or a donor. Because the surrogate is genetically related to the baby, traditional surrogacy is the older, more complicated form of the arrangement — and it's become far less common in the United States.

Gestational Surrogacy, Defined

In gestational surrogacy, the surrogate carries an embryo created through IVF using the egg of an intended parent or a donor. She has no genetic connection to the baby at all. This is the model the overwhelming majority of modern surrogacy journeys — including every journey we support at On Fertility Ground — are built on.

A helpful way to hold the distinction: a traditional surrogate contributes her egg and carries the pregnancy; a gestational surrogate carries a pregnancy that is genetically someone else's.

Quick Comparison

• Genetic link to the baby — Traditional: yes. Gestational: no.
• How conception happens — Traditional: usually IUI with the surrogate's own egg. Gestational: IVF with another person's egg.
• Legal complexity — Traditional: higher. Gestational: more straightforward.
• How common today — Traditional: rare. Gestational: standard.

Why the Legal Side Is So Different

Because a traditional surrogate is the biological mother, establishing the intended parents' legal parentage takes extra steps. Her parental rights generally have to be formally terminated, and the non-biological intended parent often has to complete a step-parent or second-parent adoption to be recognized. Gestational surrogacy avoids most of that: with no genetic tie, parentage is far cleaner to establish, frequently through a pre-birth or post-birth order rather than an adoption. Our plain-language guide to the gestational surrogacy agreement covers how that works.

There's an emotional dimension to that genetic link as well. Being the biological mother can make the arrangement more emotionally complex for everyone, which is part of why so many agencies and fertility clinics have moved away from it. The history of how the industry got here is a story of its own — we tell it in our post on the history of surrogacy in the United States.

Which One Does On Fertility Ground Do?

We are a gestational surrogacy agency. Every journey we build is gestational, so our surrogates are never genetically related to the babies they carry. We made that choice deliberately — it's the safest, clearest path for our surrogates and for the families we serve, and it lets everyone move forward with less legal risk and more peace of mind.

If you came here trying to figure out which model fits your family or your goals as a surrogate, that clarity is exactly what a good agency should give you — before anyone signs anything. Still weighing your options? We'll explain how gestational surrogacy works, start to finish, in plain terms. Reach out at 510-808-6948 or info@onfertilityground.com to talk with our team.

This article is for general education and is not medical or legal advice. Surrogacy eligibility is always determined case by case by a fertility clinic's physician and a licensed reproductive attorney, and surrogacy laws vary by state. For guidance on your specific situation, reach out to our team.