By Dr. Shweta Agarwal, MBBS, DGO Medically reviewed by Dr. Shweta Agarwal, MBBS, DGO Last updated: June 2026
Information on this page is educational and does not replace a medical consultation. Outcomes depend on individual clinical factors.
Aansh Hospital & IVF Center is a government-registered Level-2 ART clinic (Reg. No. MH/AC/2024/15441/L2/Chandrapur/132), with our clinical and embryology teams operating from our Chandrapur headquarters. Our ART registration covers IVF including embryo transfer. This page does not explain the embryo transfer procedure step by step — the IVF treatment page and frozen embryo transfer page cover those in detail. What this page addresses is the specific, and often emotionally charged, question couples face: how many embryos should we transfer?
"Ek embryo transfer karaycha ki don?" — this question sits at the centre of what may be the most values-laden decision in a fertility treatment cycle. It involves clinical factors (embryo quality, age, prior history), a genuine trade-off (per-transfer chance versus multiple-pregnancy risk), and personal values that vary between couples. What follows is the clinical framework that informs this discussion at Aansh, so that couples can enter it fully informed.
What is the actual trade-off between single and double embryo transfer?
The trade-off is real and both sides of it matter.
Transferring two embryos increases the probability that at least one will implant in any given transfer — particularly when embryo quality is lower or prior transfers have failed. It also introduces a meaningful probability of both embryos implanting, resulting in a twin pregnancy.
Transferring one embryo (eSET — elective single embryo transfer) reduces the twin risk substantially, at some cost to the per-transfer chance of pregnancy in certain clinical situations. However, when the embryo transferred is a good-quality blastocyst, the per-transfer outcomes with eSET can be comparable to double transfer for appropriate candidates.
The critical clinical context: twin pregnancy from IVF is not simply "a bonus" — it is a medically significant risk category. This is an educational, factual point, not an attempt to discourage couples who conceive twins. The clinical realities are covered in the section below.
What are the medical risks of a twin pregnancy?
Twin pregnancies — including those arising from IVF — carry elevated risks compared to singleton pregnancies. These are established medical facts, not designed to alarm:
Maternal risks include:
- Gestational diabetes at higher rates than singleton pregnancies
- Gestational hypertension and pre-eclampsia at elevated rates
- Anaemia
- Higher rates of caesarean delivery
- Pre-term labour
Neonatal risks include:
- Pre-term birth (twins are often born before 37 weeks; many are born before 34 weeks)
- Low birth weight, which correlates with neonatal intensive care admission
- Neonatal intensive care unit (NICU) admission at higher rates than singletons
- Higher rates of complications associated with prematurity
For any couple considering double embryo transfer, understanding these risks is part of the informed consent process — not a reason to categorically avoid it, but a reason to weigh it carefully against the clinical picture. Couples who wish to discuss high-risk pregnancy management can speak with Dr. Shweta Agarwal, who covers high-risk obstetric care as part of the clinical practice at Aansh; more on high-risk pregnancy is available at /treatments/high-risk-pregnancy.
When is elective single embryo transfer (eSET) the clinically supported recommendation?
eSET is strongly supported in the following situations:
Good-quality blastocyst available. A well-graded blastocyst (day 5/6, with a good inner cell mass and trophectoderm score) has a per-embryo implantation potential that makes eSET clinically reasonable — the added benefit of a second embryo is reduced, and the added twin risk remains.
Younger woman with good ovarian reserve. In women under 35 with a good response to stimulation, multiple good-quality embryos may be available. Transferring one at a time — and using frozen embryos for subsequent attempts if needed — is a strategy that reduces multiple-pregnancy risk while maintaining cumulative chances over multiple cycles.
Frozen embryos available for subsequent FET. eSET is most clinically rational when the couple has additional cryopreserved embryos. If a single-embryo transfer does not result in pregnancy, the next frozen embryo can be transferred in a subsequent cycle. The cumulative chances across multiple frozen transfers are preserved.
Uterine factors that increase twin risk. Certain uterine anatomical factors increase the maternal risk associated with twin pregnancy; in these cases, eSET is clinically preferred regardless of embryo quality.
When might double embryo transfer be considered?
Double embryo transfer may be considered in the following clinical situations:
Multiple prior failed transfers. After several unsuccessful single-embryo transfers where embryo quality was not the suspected cause, the clinical picture may support transferring two embryos. The reasoning is that the empirical failure rate suggests a factor beyond per-embryo quality, and the probability of both implanting in this context may be lower than in a de-novo cycle.
Older female age with reduced ovarian reserve. In women over 38 where ovarian reserve is limited and the available embryos are cleavage-stage (not blastocyst), the per-embryo implantation potential is lower and the number of future attempts is more limited. The clinical discussion about double transfer becomes more nuanced.
Poor embryo quality across the cohort. When all available embryos are of reduced quality, the probability of both implanting — and therefore the twin risk — is lower than with high-quality blastocysts. The risk-benefit calculation shifts.
Few or no embryos in reserve. If the available embryo is the only one and there are no frozen backups, the decision is different from one made in the context of a full frozen bank.
The discussion of double transfer is always contextualised by the twin-pregnancy risk. The decision is made with the couple, not for them — but the medical picture is presented clearly.
Single vs double embryo transfer: a side-by-side comparison
| Factor | Elective Single ET (eSET) | Double Embryo Transfer (DET) |
|---|---|---|
| Embryos transferred | 1 | 2 |
| Twin pregnancy risk | Low | Meaningfully elevated |
| Per-transfer pregnancy chance | Comparable to DET with good blastocyst; lower with cleavage-stage or poor-quality embryos | Higher per-transfer than eSET in most groups |
| Supported by frozen backups? | Ideal — cumulative chance preserved across FET cycles | Less critical — depends on reserve |
| Supported at blastocyst stage? | Strongly — blastocyst grading supports eSET confidence | Reasonable with poor-quality or cleavage-stage |
| Ideal candidate | Under 35, good blastocyst, frozen embryos available | Older patient, multiple prior failures, limited reserve, poor embryo quality |
| Maternal risk profile | Lower | Elevated due to twin risk |
| Neonatal risk profile | Lower | Elevated due to prematurity risk with twins |
| Cumulative outcomes over time | Comparable to DET when frozen embryos are used across cycles | Single-cycle metric higher; cumulative may not differ significantly |
What does the evidence say about cumulative outcomes?
Studies examining cumulative pregnancy outcomes — meaning the total result across fresh plus frozen transfers from a single egg-retrieval cycle — have generally found that eSET with FET of remaining embryos produces comparable cumulative outcomes to double transfer, while substantially reducing twin rates.
This cumulative framing is important: when a couple asks "aren't we reducing our chance of pregnancy by transferring one embryo?", the answer in many clinical scenarios is: not over the full course of treatment, but possibly in any single transfer. The distinction matters.
The clinical consensus among reproductive medicine societies supports eSET as the preferred approach in good-prognosis patients — those with good-quality blastocysts, younger age, and frozen embryos available — because it achieves comparable cumulative outcomes while avoiding the twin risk.
How is the embryo-number decision made at Aansh?
The discussion happens before the transfer, usually at the point when the embryo cohort has been assessed and the number and quality of available embryos is known. Inputs include:
- Embryo quality and stage — a high-quality blastocyst is the clearest case for eSET.
- Female age — younger patients with good prognosis are the strongest eSET candidates.
- Number of prior failed transfers — history of unexplained failure shifts the calculation.
- Number of frozen embryos in reserve — eSET is most rational with backup embryos available.
- The couple's own understanding of the twin risk — an informed, values-consistent decision.
Dr. Shweta Agarwal discusses all of these factors with the couple before transfer. The recommendation is made, the reasoning is explained, and the couple's questions are answered before any decision is finalised.
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