Donor Egg Preparation
IVF & ART

Donor Egg & Embryo
Recipient Preparation

The egg is donated — but the uterine environment, immune response, and early embryo nourishment come entirely from you. Your preparation is a genuine biological contribution to your child.

Your Role in the Cycle →
ERA
personalises transfer timing — critical in donor cycles
Immune
tolerance is the primary determinant of implantation success
Epigenetics
your uterine environment shapes embryo gene expression
Vitamin D
most important immune-modulating supplement for recipients

Key Principles for Recipients

Your Role in a Donor Cycle

In a donor egg or donor embryo cycle, the genetic material comes from the donor — but the uterine environment, immune response, and early embryo nourishment come entirely from you. The recipient's preparation is just as important as the donor's egg quality. Endometrial receptivity and immune tolerance are the primary determinants of success.

Immune Tolerance & Implantation

The embryo carries paternal (and donor) antigens that are foreign to the recipient's immune system. Successful implantation requires active immune tolerance — a shift from a pro-inflammatory (Th1) to a regulatory (Th2/Treg) immune environment. This is why immune preparation is particularly important in donor cycles, especially for recipients with a history of implantation failure.

Epigenetics: Your Contribution Matters

Although the egg is donated, the recipient's uterine environment shapes the epigenetic expression of the embryo during implantation and early development. Maternal nutrition, stress hormones, inflammatory cytokines, and uterine blood flow all influence which genes are expressed in the developing embryo. Your preparation is a genuine biological contribution to your child.

Endometrial Support Protocol

Discuss all supplements with your specialist before starting.

Vitamin D3
Target 100–150 nmol/L
Regulates endometrial HOXA10 and LIF expression — key implantation genes; immune-modulating at optimal levels
Omega-3 (DHA/EPA)
2 g/day
Reduces endometrial inflammatory cytokines; supports prostaglandin balance; improves uterine blood flow
L-arginine
2–3 g/day
Nitric oxide precursor — improves uterine blood flow and endometrial thickness; particularly useful for thin lining
Active folate (methylfolate)
800 mcg–1 mg/day
Required for endometrial decidualisation and early embryo development; methylfolate bypasses MTHFR variants
Vitamin E
400–600 IU/day
Antioxidant support for endometrial cells; evidence for improving thin endometrium
Low-dose aspirin
100 mg/day (practitioner-guided)
Improves uterine blood flow via antiplatelet effect; commonly used in donor cycles

Immune Considerations

Discuss immune preparation with your specialist — particularly if you have a history of implantation failure.

Vitamin D3 at 100–150 nmol/L
Vitamin D is a potent immune modulator — it promotes T-regulatory cell activity and reduces NK cell cytotoxicity. Deficiency is associated with implantation failure in donor cycles.
Omega-3 fatty acids
DHA and EPA shift the immune environment toward Th2 dominance and reduce NK cell activity. Particularly relevant for recipients with elevated uterine NK cells.
Intralipid infusion
Intravenous lipid emulsion (Intralipid) is used in some clinics to reduce uterine NK cell activity before transfer. Discuss with your specialist if you have a history of implantation failure.
Progesterone support
Progesterone is the primary immune-modulating hormone of pregnancy — it promotes Treg activity and suppresses NK cell cytotoxicity. Adequate progesterone support is essential in donor cycles.
Prednisone/prednisolone
Low-dose corticosteroids are used in some donor protocols to reduce immune activation around transfer. Discuss with your specialist.
Your Action Plan

Recipient Preparation Checklist

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Before Your Donor Cycle

Confirm Vitamin D level — supplement to 100–150 nmol/L before cycle start
Start omega-3 DHA/EPA 2 g/day
Confirm active folate (methylfolate) in prenatal supplement
Ask your clinic about ERA testing — particularly important in donor cycles
Discuss immune testing if you have a history of implantation failure
Ask about progesterone type, route, and monitoring in your protocol

Endometrial Preparation Phase

Maintain hydration 2–2.5 L/day
Anti-inflammatory Mediterranean diet throughout
Gentle movement — walking, yoga, stretching
Prioritise sleep 7–9 hours
Reduce psychological stress — consider acupuncture or mindfulness
Avoid NSAIDs (ibuprofen) — can impair implantation

Emotional Preparation

Allow yourself to grieve the genetic connection if needed — this is a real loss
Connect with donor egg community groups — peer support is valuable
Discuss disclosure plans with your partner before the cycle
Work with a counsellor experienced in donor conception if needed
Remember: your uterine environment is a genuine biological contribution
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