Skip to content 
A question everyone has in mind at the beginning of a surrogacy process is: how can it be ensured from day one that the surrogate meets the highest health standards? The answer lies in a mandatory, extensive, and well-organized medical protocol that begins long before the embryo transfer. Understanding this protocol completely transforms one’s perspective on the process.
When someone seeks information about medical studies for surrogates, they are usually in the initial stages of learning. They want to understand what controls are in place, what infectious disease tests are performed, and to what extent health requirements are regulated. This article addresses that need with medical clarity and a practical approach, so you can understand how the health of the surrogate and the unborn baby is protected from the very beginning.
Why are medical studies in surrogates essential?
Surrogacy is not simply a reproductive agreement, but a complex medical procedure that demands strict clinical safeguards. Mandatory medical examinations are not merely an administrative formality, but the foundation upon which pregnancy safety is built. All prospective surrogates must demonstrate optimal physical and reproductive health. This not only reduces obstetric risks, but also minimizes the possibility of transmitting infectious diseases and complications during pregnancy.
Medical studies of surrogates have three fundamental objectives. The first is to rule out transmissible infectious diseases. The second is to evaluate their reproductive capacity and obstetric history. The third is to confirm that there are no chronic diseases that could compromise the pregnancy or the health of the newborn.
The first safety filter is mandatory infectious disease testing. One of the cornerstones of the mandatory medical examinations in any surrogacy process is infectious disease testing. These tests aim to rule out diseases that can be transmitted to the fetus during pregnancy, childbirth, or perinatal contact. Among the most relevant infectious disease tests is HIV screening; infection with the human immunodeficiency virus must be ruled out through specific serological tests. Early detection is essential, as pregnancy can alter the course of the disease, and without treatment, there is a risk of vertical transmission.
Serological testing for hepatitis B and hepatitis C is also performed. Both infections can be transmitted from mother to child during childbirth, so their detection is essential before starting the process.
Syphilis is another infection that must be screened for. This disease, caused by the bacterium Treponema pallidum, can lead to serious complications if not detected and treated properly. Immunity to rubella and chickenpox is also assessed. Although these are not always active infections, knowing the candidate’s immune status is crucial, as these diseases can cause birth defects if contracted during pregnancy.
Medical screenings for surrogates also include tests for cytomegalovirus, toxoplasmosis, and, depending on the clinical protocol, herpes simplex virus. These infections, although common in the general population, can have fetal consequences if they occur first during pregnancy. It is important to understand that these tests are not intended to indiscriminately exclude any risks, but rather to ensure that any potential risks are identified and managed before embryo transfer begins.
Gynecological and reproductive evaluation (beyond infections)
Mandatory medical examinations are not limited to the detection of infectious diseases. A comprehensive gynecological evaluation is equally essential in a surrogacy process.
A complete physical examination and a detailed review of the obstetric history are performed. Clinics analyze how many previous pregnancies the candidate has had, whether they were vaginal deliveries or cesarean sections, and whether there were any complications such as preeclampsia, gestational diabetes, or premature birth. Scientific evidence shows that the best predictor of a healthy pregnancy is having had previous pregnancies without complications. Therefore, one of the usual requirements is that the surrogate has had at least one previous full-term pregnancy without serious medical issues.
For uterine evaluation, transvaginal ultrasounds are performed to assess the anatomy of the uterus and rule out significant fibroids, endometrial polyps, or uterine malformations. In some cases, this is complemented with hysteroscopy or sonohysterography to examine the endometrial cavity more precisely.
Medical studies in surrogates also include recent cervical cytology to rule out premalignant lesions or high-risk human papillomavirus (HPV) infection. This is crucial, as cervical health directly influences the course of the pregnancy.
General analysis and control of chronic diseases
Pregnancy involves profound metabolic, cardiovascular, and endocrine changes. Therefore, mandatory medical tests include comprehensive blood work that assesses complete blood count, kidney function, liver function, lipid profile, and glucose levels.
Significant anemia, thyroid disorders, and undiagnosed diabetes are ruled out. Thyroid dysfunction, for example, can affect fetal neurological development if not properly controlled. Blood pressure and body mass index are also assessed. Obesity and chronic hypertension increase the risk of obstetric complications such as preeclampsia and intrauterine growth restriction.
In the context of surrogacy, these checks are not merely preventative, but rather selection criteria. A candidate with a poorly controlled chronic illness would not be considered suitable until her condition stabilizes.
Mental health and psychological assessment: Although the main focus of this article is on medical studies of surrogates, psychological assessment, which is an integral part of mandatory medical studies in most international programs, cannot be ignored. Emotional stability, understanding of the process, and the ability to cope with a pregnancy for others are aspects assessed by mental health professionals. This assessment is not a mere formality, but rather a protective measure for both the surrogate and the intended parents.
Toxicological testing and lifestyle: Another relevant component of medical studies in surrogates is the evaluation of lifestyle habits. Toxicological tests are performed to rule out the use of illicit drugs, nicotine, or alcohol abuse. Substance use can affect fetal development and increase the risk of premature birth, low birth weight, and neonatal complications. Therefore, the absence of active substance use is a mandatory requirement.
In addition, the overall lifestyle is analyzed, including diet, physical activity, and social environment. The aim is not to judge, but to ensure optimal conditions for pregnancy.
Genetic testing and compatibility: Some surrogacy programs include basic genetic testing of the surrogate, especially to rule out hereditary diseases prevalent in certain populations. Although the embryo’s genetic material comes from the intended parents or donors, knowing the surrogate’s genetic health can be relevant in specific contexts, particularly if there is a risk of immunological interaction or a significant family history.
These mandatory medical studies vary according to the legislation and clinical protocols of the country where the procedure is performed.
Discover the program that best suits your situation and find out which countries are the most suitable to start your process.
Schedule an appointment with one of our Family Experts and get all your questions answered… We are here to support you every step of the way.
How often are infectious disease tests repeated?
A frequently asked question in this information phase is whether infectious disease tests are performed only once or need to be repeated.
In most surrogacy protocols, tests are initially performed during the selection process and repeated before embryo transfer if a certain period has elapsed. Additionally, some tests may be repeated during pregnancy as part of standard prenatal care.
This repetition does not indicate distrust, but rather the rigorous application of international medical protocols.
Once pregnancy is confirmed, medical monitoring of the surrogate continues under the framework of standard obstetric care. This includes regular ultrasounds, prenatal screening tests, glucose tests to rule out gestational diabetes, and blood pressure monitoring. The difference in surrogacy lies in the constant coordination between the medical team, the surrogate, and the intended parents, ensuring transparency and continuous follow-up.
Understanding the scope of mandatory medical studies changes one’s perspective on the safety of the process. This is not a spontaneous pregnancy, but one that is carefully planned and evaluated before it begins.
Every infectious disease test, every blood test, and every gynecological evaluation is part of a system designed to reduce risks and maximize the chances of success.
Conclusion
When we talk about medical studies in surrogates, we’re talking about prevention, evidence-based medicine, and shared responsibility. Infectious disease tests are not mere administrative requirements, but rather protective tools for the baby, the surrogate, and the expectant parents.
Surrogacy, when performed under rigorous medical protocols, includes comprehensive monitoring of physical, reproductive, infectious, and psychological health. Mandatory medical examinations not only guarantee the surrogate’s clinical suitability but also reflect the ethical commitment of the process.
Understanding each of these tests allows us to appreciate the complexity and care behind every surrogacy pregnancy. And perhaps that’s the aspect least visible from the outside, but the one that offers the most peace of mind when understood in depth.
