The Medical Screening Checklist for Surrogacy: What Gets Tested and When

Screening in surrogacy protects four parties at once: the carrier, the child, the intended parents, and the embryo. It is easy to treat it as paperwork to clear before a transfer, and it is more useful to read it as the point where most medical risk in the whole journey is identified.

The checklist below is not universal. Clinics differ, countries differ, and a carrier who has recently carried a pregnancy for the same clinic may need less repeat testing than someone new to the programme. What follows is the full set, so that gaps can be spotted rather than assumed.

Screening the Carrier: Medical History and Baseline

The process begins with a full obstetric history. Previous pregnancies, their outcomes, gestation at delivery, birth weight, any caesarean and the indication for it, any postpartum haemorrhage, and any pre-eclampsia all matter. A prior uncomplicated term delivery is the single strongest positive indicator a programme can find.

Age and body mass index are assessed against clinic thresholds, which commonly sit around forty for age and a defined BMI range. These are not arbitrary; both are associated with pregnancy complications, and clinics set limits rather than weighing each case.

General health screening covers blood pressure, a full blood count, thyroid function, and diabetes screening where indicated. Undiagnosed thyroid disease and unrecognised glucose intolerance are two of the more common findings in an otherwise healthy candidate.

Reproductive Anatomy

The uterine cavity has to be evaluated. A cavity distorted by fibroids, polyps, or a septum is associated with implantation failure and with pregnancy loss, and each of these is treatable if found before a transfer rather than after it.

Evaluation is usually by saline infusion sonohysterography or hysteroscopy, and the choice depends on what the initial ultrasound suggests. A transvaginal scan alone is not sufficient to exclude an intracavitary lesion.

A cervical assessment and a current cervical screening test are standard. An abnormal result does not automatically exclude a candidate, but it does need to be resolved before she is cleared, because the timeline for investigation and treatment is not short.

Infectious Disease Screening

Carriers are screened for HIV, hepatitis B, hepatitis C, syphilis and HTLV, among others depending on the country. These tests exist to protect the child and the embryo, and they are repeated rather than performed once.

The repeat schedule is the part people miss. Results have a validity window, typically three to six months, and a test performed at matching may have expired by the time a transfer is scheduled a year later. Expiry causes cancelled cycles, which are expensive and demoralising in equal measure.

Immunity status is checked alongside infection status. Rubella and varicella immunity in particular can be established by vaccination before pregnancy but not during it, so a non-immune carrier needs immunising and then a waiting period before transfer.

Public health guidance on screening in pregnancy, including the recommendations published by the Centers for Disease Control and Prevention, is a useful reference for why each of these tests is on the list.

Screening the Carrier’s Partner

Where the carrier has a sexual partner, that partner is screened as well. The reason is straightforward: the carrier can be exposed between her own test and the transfer, and a negative result on the day of screening says nothing about the following months.

This is one of the more awkward conversations in the process and is best handled as routine rather than as an accusation, which is how a good counsellor frames it.

Psychological Assessment

A psychological evaluation by a mental health professional experienced in third-party reproduction is standard in well-run programmes and is not a formality. It assesses the candidate’s understanding of what she is agreeing to, her support network, and her reasons for wanting to do it.

It also establishes a baseline. A carrier who has a difficult pregnancy or a complicated emotional response afterwards is better served by a clinician who already knows her than by one meeting her for the first time at that point.

Medication and Substance Screening

Drug screening is standard, and a full medication review is more informative than the drug screen. Several common medications are contraindicated in pregnancy, and switching them, or establishing that the underlying condition is stable without them, takes time.

Smoking, alcohol, and vaping are addressed explicitly. Most programmes require cessation well before transfer, and the requirement is usually verified rather than accepted on trust.

Screening the Intended Parents

Intended parents providing gametes are screened in much the same way as any IVF patient: infectious disease testing with the same validity windows, and a medical history focused on heritable conditions.

Genetic carrier screening is offered where it is available, and its purpose is to identify whether both gamete providers carry a variant for the same recessive condition. Where a donor gamete is used, the donor has been screened for the same panel, and the results should be shared with the intended parents.

Where the intended mother cannot provide eggs, the reason is usually already documented. Where it is not, a fertility workup establishing the indication for surrogacy is part of the clinic’s acceptance process.

Guidance on the medical evaluation of candidates for gestational carriage is published by the American Society for Reproductive Medicine, and it is the closest thing to a consensus standard that the field has.

Timing: How the Sequence Actually Runs

A realistic sequence starts with acceptance of the intended parents, then carrier screening, then a psychological assessment, then legal work, then cycle scheduling. These overlap rather than run strictly in order, and the critical path is usually whichever item has the longest validity window or the longest wait.

Cycle scheduling is coordinated with donor availability where donor eggs are used. The carrier’s cycle is suppressed or synchronised depending on the protocol, and the transfer date is fixed only once monitoring confirms the endometrium is ready.

The practical advice is to front-load anything that can expire. Rubella vaccination, cervical screening, and dental work all have lead times and all become impossible or undesirable once a pregnancy is underway.

What to Ask Your Clinic

Ask what the validity window is for each test and who tracks it. A programme that cannot answer has probably had a cycle cancelled for this reason and will have one again.

Ask what happens if a result is borderline. The answer reveals whether the clinic has a defined pathway or improvises case by case, and it is a reasonable proxy for how the rest of the programme runs.

Ask what screening is repeated and what is accepted from outside the clinic. Records transferred from a carrier’s own physician are usually acceptable, but only if they are recent and complete.

General information on preconception health and on the tests that precede fertility treatment is available from sources including the National Institute of Child Health and Human Development, which is a reasonable starting point for questions to bring to an appointment.

Vaccinations and the Waiting Periods They Create

Non-immunity to rubella or varicella is one of the most common findings in an otherwise straightforward candidate, and it is entirely fixable. What it costs is time: live vaccines require a waiting period, commonly around four weeks or longer depending on the vaccine and the protocol, before a transfer can proceed.

Seasonal influenza vaccination and, where recommended, pertussis vaccination are given during pregnancy rather than before it, but scheduling them is easier when the cycle calendar already exists. A candidate who is not immune should be vaccinated at the start of the process so that the waiting period runs alongside the other screening rather than after it.

Screening for a Second Journey

A carrier who has previously carried for the same clinic is often cleared faster, because her obstetric history is now the strongest evidence available and much of her baseline work is on file. Infectious disease screening and any test with a validity window are repeated regardless.

The one item that should be reviewed afresh is the caesarean record where the previous delivery was surgical. The scar, the indication for the section, and any complications in that recovery determine whether a subsequent pregnancy is straightforward, and that assessment belongs to an obstetrician rather than to the matching process.

Frequently Asked Questions

How long does surrogacy screening take?

Typically six to twelve weeks for a candidate already engaged with a programme, and longer where a finding needs investigating. Rubella immunisation and cervical screening follow-up are the most common causes of delay.

Do screening results expire?

Yes. Most infectious disease results have a validity window of three to six months, and results from the matching stage frequently expire before a transfer date is reached.

Why is the surrogate’s partner tested?

Because exposure between the carrier’s test and the transfer can occur. Testing only the carrier leaves a gap that most programmes are not willing to accept.

Is psychological screening mandatory?

In well-run programmes, yes. It protects the carrier as much as the intended parents and establishes a relationship with a clinician before it is needed.

What screening does a disqualify a candidate?

Positive infectious disease results, an untreated cervical abnormality, significant uterine pathology, and certain medical conditions are the common exclusions. Many findings are treatable rather than disqualifying, and the distinction is worth asking about.

Related guide: How to Choose a Surrogate Mother (2026)