Becoming a surrogate mother is a major medical responsibility. Before an embryo is transferred, the surrogate needs to be evaluated carefully to make sure her body is prepared for pregnancy and that any potential health concerns are identified early.

The medical screening process is not simply about checking whether a woman can become pregnant. It looks at her previous pregnancy history, overall health, uterus, blood type, infectious diseases, vaccinations, and other factors that may affect pregnancy. Professional guidelines from the American Society for Reproductive Medicine (ASRM) recommend medical evaluation, laboratory testing, infectious-disease screening, preconception testing, uterine assessment, and psychosocial evaluation for gestational carriers.

For intended parents considering programs such as a surrogate mother in Colombia, understanding these tests can make the process easier to understand. The exact tests can vary depending on the fertility clinic, the surrogate’s medical history, and the country’s regulations.

Why Does a Surrogate Mother Need Medical Screening?

A surrogate pregnancy involves carrying an embryo created through IVF. Because the surrogate will experience the pregnancy and its physical demands, doctors need to establish that she is medically suitable before treatment begins.

The screening process helps doctors:

• Identify health conditions that could increase pregnancy risks.
• Check whether the uterus is suitable for embryo implantation.
• Detect infections that could affect the pregnancy or baby.
• Identify anemia or other blood-related problems.
• Confirm blood type and Rh status.
• Review previous pregnancies, births, miscarriages, and cesarean deliveries.
• Check vaccination and immunity status.
• Identify conditions that may need treatment before embryo transfer.

ASRM recommends that a potential gestational carrier undergo a complete medical evaluation by a qualified healthcare professional before acceptance into a program.

1. Complete Medical and Pregnancy History

The first step is usually a detailed medical history. The doctor may ask about previous pregnancies, vaginal deliveries, cesarean sections, miscarriages, pregnancy complications, gestational diabetes, high blood pressure during pregnancy, preterm birth, postpartum complications, and previous fertility treatments.

The medical team may also ask about:

• Previous surgeries.
• Chronic medical conditions.
• Current medications and supplements.
• Allergies.
• Menstrual history.
• Previous gynecological problems.
• Family history of certain diseases.
• Smoking, alcohol, or recreational drug use.
• Previous infections or sexually transmitted infections.

Previous pregnancy history is particularly relevant because doctors want to understand how the woman’s body has responded to pregnancy before. ASRM notes that an ideal gestational carrier has previously experienced at least one term, uncomplicated pregnancy.

This does not mean every individual program follows exactly the same criteria. Medical teams assess each potential surrogate individually.

2. Physical Examination

A general physical examination is another important part of screening. The doctor may check blood pressure, weight, pulse, and general health. Depending on the woman’s medical history, the physician may also examine the heart, lungs, abdomen, and other areas relevant to pregnancy.

A gynecological examination may also be performed when appropriate. The purpose is not simply to determine whether someone appears healthy. Some medical conditions have few noticeable symptoms, so a physical examination can help identify issues that require additional testing.

3. Blood Tests

Blood testing is one of the most common parts of pre-pregnancy screening. A complete blood count (CBC) may be performed to check red blood cells, white blood cells, and platelets. It can help identify anemia and other blood-related abnormalities. ACOG also lists CBC among routine laboratory tests used early in pregnancy.

Doctors may also evaluate:

• Hemoglobin levels.
• Blood group.
• Rh factor.
• Blood sugar when clinically indicated.
• Other tests based on the woman’s medical history.

Knowing the blood group and Rh factor is important because Rh incompatibility can have implications during pregnancy and may require appropriate management.

Not every woman will need the same additional blood tests. A doctor may order thyroid, glucose, liver, kidney, or other tests when symptoms, medical history, or previous pregnancy complications make them appropriate.

4. Infectious Disease Screening

Infectious disease screening is a major part of gestational-carrier evaluation. The goal is to identify infections that could affect the surrogate, pregnancy, or developing fetus.

ASRM recommends screening gestational carriers and their partners for several infections before embryo transfer. The recommended testing includes HIV, hepatitis B, hepatitis C, syphilis, and testing for gonorrhea and chlamydia.

Depending on the clinic and country, screening may include:

• HIV testing.
• Hepatitis B testing.
• Hepatitis C testing.
• Syphilis testing.
• Gonorrhea testing.
• Chlamydia testing.
• Other infection-related tests when medically appropriate.

These tests are usually performed using blood, urine, or swab samples. For an international fertility program, infectious-disease screening can be especially important because medical protocols may differ between countries.

5. Rubella and Varicella Immunity

Doctors may also check whether the surrogate has immunity to certain infections, particularly rubella and varicella. ASRM specifically recommends checking titers for rubella and varicella as part of preconception testing.

Why does this matter?

Some infections can cause complications during pregnancy. Knowing whether a woman is already immune allows the medical team to plan appropriately before pregnancy.

If vaccination is recommended, the fertility clinic may advise completing it before embryo transfer because some vaccines are not given during pregnancy. The exact vaccination plan should always be discussed with the treating doctor.

6. Cervical Cancer Screening

Cervical screening may be required depending on the surrogate’s age, previous screening history, and local medical guidelines. ASRM recommends cervical cancer screening according to applicable ACOG guidance.

The purpose is to identify abnormal cervical cells or other concerns that should be evaluated before pregnancy. A woman who is already up to date with her screening may not need another test immediately. The clinic will usually review her previous records and determine whether updated screening is necessary.

7. Uterine and Pelvic Evaluation

One of the most important parts of surrogate screening is evaluating the uterus. The uterus needs to be able to support embryo implantation and pregnancy.

Doctors may use ultrasound to examine:

• The shape of the uterus.
• The thickness and appearance of the endometrium.
• The ovaries.
• Fibroids.
• Polyps.
• Other structural abnormalities.

ASRM specifically recommends a uterine cavity evaluation, such as a saline-infusion sonogram or another appropriate method, before accepting a gestational carrier. Depending on the findings, a doctor may recommend additional investigations such as hysteroscopy.

This part of the evaluation is particularly relevant because an apparently healthy woman can still have a uterine condition that may affect implantation or pregnancy.

8. Screening for Anemia and Hemoglobin Disorders

Anemia is common enough to make blood testing an important part of preconception care. A CBC can provide information about hemoglobin and red blood cell indices. In certain circumstances, doctors may recommend additional testing for conditions such as sickle cell disease or thalassemia.

ACOG recommends CBC testing and, when indicated, hemoglobin electrophoresis or other testing to evaluate possible hemoglobin disorders. If an abnormal result is found, the doctor can investigate the cause and determine whether treatment or further evaluation is needed before pregnancy.

9. Urine Testing

Urine testing may also be part of the medical assessment. A urinalysis can help identify signs of urinary infection, kidney-related problems, or other abnormalities. A urine culture may be ordered when an infection is suspected or according to the clinic’s protocol.

ACOG lists urinalysis and urine culture among laboratory tests commonly used during early pregnancy. Some fertility programs may also include a urine drug screen as part of gestational-carrier screening. ASRM includes this among recommended preconception testing.

10. Mammogram When Appropriate

A mammogram is not automatically required for every potential surrogate. ASRM recommends mammography according to applicable age- and risk-based guidelines.

The need for this screening depends on factors such as age, personal history, family history, and previous screening. The fertility clinic or primary healthcare provider can determine whether it is appropriate before pregnancy.

11. Genetic Testing: What About the Surrogate?

Genetic testing can sometimes be confusing because the surrogate in a gestational-surrogacy arrangement generally does not provide the egg. The embryo is created using the egg and sperm of the intended parents or donors. Therefore, genetic screening of the egg and sperm sources is particularly relevant to assessing inherited conditions.

ASRM recommends genetic evaluation for genetic contributors, with screening for conditions such as cystic fibrosis, spinal muscular atrophy, and thalassemia or other hemoglobinopathies, along with consideration of expanded carrier screening.

The surrogate may still undergo certain genetic or blood-related tests based on her own medical history and the clinic’s protocol. The purpose is different from testing the genetic parents. Doctors are primarily assessing the surrogate’s health and pregnancy risks.

12. Psychological and Emotional Assessment

Although this is not a laboratory test, it is an important part of the screening process. Surrogacy involves pregnancy, medical treatment, hormonal medication, childbirth, and emotional changes. A psychological evaluation can help assess whether the potential surrogate understands the process and has appropriate support.

ASRM recommends psychosocial evaluation and counseling as part of gestational-carrier screening. The goal should be informed decision-making and appropriate support, rather than simply trying to “pass” or “fail” someone.

13. Review of Medications and Lifestyle

Before pregnancy, doctors usually review all medications, supplements, and lifestyle factors. Some medicines may be safe in general but inappropriate during pregnancy. Others may need to be changed or stopped before embryo transfer.

The doctor may also discuss:

• Folic acid or prenatal vitamins.
• Smoking and alcohol.
• Recreational drug use.
• Nutrition.
• Exercise.
• Sleep.
• Weight management when clinically appropriate.
• Vaccination status.

The exact recommendations depend on the individual’s health.

14. Final Medical Clearance Before Embryo Transfer

After the tests are completed, the fertility team reviews the results together. If something abnormal is discovered, it does not automatically mean the woman cannot become a surrogate. Some findings can be treated or monitored, while others may require additional medical evaluation.

The objective is to identify potential risks before pregnancy rather than discovering them after embryo transfer.

For people researching international programs, including a surrogate mother in Cyprus, it is useful to ask the clinic for its complete medical screening checklist before beginning the process. This helps intended parents understand which tests are performed, when they are performed, and which medical records are required.

Do Surrogacy Medical Tests Differ by Country?

Yes. Medical screening is based on general principles of reproductive medicine, but individual clinics and countries can have different requirements.

Someone researching a Surrogate Mother for Gay Couples in Armenia, for example, should not assume that the exact testing protocol will be identical to a clinic in another country. The same applies when researching a surrogate mother in Cyprus or other international destinations.

The clinic may require additional tests based on local regulations, the surrogate’s medical history, the intended parents’ circumstances, or the type of fertility treatment being used.

The same principle applies to people researching a Surrogate Mother for Singles in Mexico. Medical screening should be discussed directly with the fertility specialist and the program coordinating the surrogacy.

How Long Does the Medical Screening Take?

The timeline varies. Some tests can be completed within a few days, while others may require additional appointments, imaging, or specialist consultations. If the doctor finds an issue that needs treatment or further investigation, the process can take longer.

It is better to complete the evaluation carefully than to rush toward embryo transfer. A fertility clinic will normally coordinate the medical records, laboratory results, imaging reports, and final clearance before treatment proceeds.

What Happens After the Tests?

Once the surrogate has completed the required medical evaluation and is cleared by the fertility team, the next stage may involve preparation of the uterine lining for embryo transfer.

Hormonal medication may be used to prepare the endometrium, depending on the IVF protocol. The clinic then monitors the uterine lining and schedules embryo transfer when conditions are considered appropriate.

Pregnancy testing follows the embryo transfer, and if pregnancy occurs, routine prenatal care begins. The medical process does not end with a positive pregnancy test. Regular prenatal appointments and appropriate pregnancy screening continue throughout the pregnancy.

Final Thoughts

Medical screening is one of the most important safeguards in gestational surrogacy. It gives doctors an opportunity to understand the surrogate’s health, identify infections or medical conditions, evaluate the uterus, review previous pregnancies, and prepare for a safer pregnancy.

The typical evaluation can include medical history, physical examination, blood tests, infectious-disease screening, blood group and Rh testing, cervical screening, immunity testing, urine testing, uterine evaluation, and other tests based on individual medical needs. ASRM recommends a comprehensive medical evaluation and preconception assessment before a gestational carrier is accepted.

Whether someone is researching a surrogate mother, a Surrogate Mother for Gay Couples or a Surrogate Mother for Singles the medical screening process should always be handled by qualified fertility and obstetric professionals.

The exact list of tests can differ from one clinic to another, so prospective intended parents and surrogates should request the clinic’s current medical screening requirements and discuss individual health circumstances with the treating physician.