Quick Answer: Doctors check for syphilis in pregnant women because the disease can be passed from parent to child before birth. A simple blood test can find congenital syphilis early on, which lets doctors give treatment that keeps the baby healthy and safe.
Why Syphilis Screening Is a Standard Part of Prenatal Care
One of the lesser-known facts about pregnancy medicine is that physicians are constantly working to prevent problems that never materialize. Prenatal blood tests are intended to identify problems early, even before they cause any signs of illness. Syphilis tests during pregnancy are no exception. The reason for this is that syphilis is a disease that causes very few signs of illness during its initial stages of infection, meaning that an individual can be infected without realizing that something is wrong.
This is why syphilis tests are performed during pregnancy in the first place. In recent decades, public health scientists have been aware of the dangers of untreated syphilis during pregnancy, which can cause a condition called congenital syphilis that can result in miscarriage, premature birth, or other problems for a newborn baby. The good news is that this risk can be eliminated with a single course of treatment during early pregnancy.
From a doctor's point of view, this is common sense. A single blood test can prevent a newborn baby from contracting a serious infection, so it makes sense that this is done for every patient. This is why syphilis tests are recommended during pregnancy in almost every country in the world.
Many expectant parents are uneasy when they see STD tests included in their prenatal tests, but in reality, this is not about sex history at all. Prenatal tests are about prevention, and this is why physicians take the same precautions for every patient, regardless of their history, simply because infections do not always behave in predictable ways.
For individuals who would like some reassurance before their first appointment, STD Test Kits offer a confidential syphilis test that can offer some clarity early on, even if they have not yet established prenatal care.
People are also reading: Strong Vaginal Odor: Could It Be an Infection or Something Else?
How Syphilis Can Affect Pregnancy and a Developing Baby
To understand the importance of prenatal screening, it is important to understand the nature of the syphilis infection. Syphilis is caused by a bacterium called Treponema pallidum. This bacterium infects a person through the bloodstream. When an adult is infected, the initial symptoms may be a painless sore called a chancre or a rash. However, the problem is that the symptoms are not obvious to the patient. They may think the symptoms are minor.
When a pregnant woman is infected with the bacteria, they can cross the placenta to the baby. This occurs without the pregnant woman displaying symptoms. The pregnant woman may feel perfectly normal while the infection is quietly entering the baby’s bloodstream. This is the reason why the medical community does not rely on symptoms to determine whether to perform a test.
The outcome of the infection may be varied. Some babies may not display symptoms of the infection when they are born. However, they may display health problems later on. Others may display problems even before birth. However, the outcome is entirely different when the baby is diagnosed early. This is because the infection can be halted when the mother is given medical attention.
The table above may look scary, but it shows what can happen if the infection goes undetected and untreated. These outcomes are mostly avoidable in modern prenatal care systems where routine testing is the norm.
Doctors stress screening because it gives you a short amount of time when prevention works really well. A routine blood test shows antibodies made by the immune system in response to the infection. Once the infection is found, treatment can start right away, which greatly lowers the risk of congenital infection.
In other words, prenatal screening isn't so much about taking a chance as it is about finding a problem before it ever gets to a baby.
When Doctors Test for Syphilis During Pregnancy
Timing is everything when it comes to prenatal screening. Most expecting parents are first offered a blood test for syphilis during pregnancy during their very first prenatal appointment. This initial prenatal appointment typically occurs during the first trimester of pregnancy. During this initial visit, a wide array of tests is ordered to create a baseline of the health of the expecting parent.
For the most part, this initial blood test is all an expecting mother needs. However, there are some circumstances where a second blood test may be ordered later on during the pregnancy. Recommendations to order a second blood test during the third trimester or at the time of birth have been made in areas where congenital syphilis is more common.
The rationale for a second blood test is rather simple. If an infection occurs later on during the pregnancy, it may not have occurred prior to the initial blood test.
The multi-layered method may seem redundant at first glance, but it is a result of decades' worth of data that proves that repeated screening measures greatly reduce congenital infections.
For those whose care is delayed or for those whose location is far from a medical facility, early screening may be a source of reassurance. Some may prefer the privacy that a screening kit like the Complete 10-Test STD Panel offers before or between medical visits.
The end result is the same regardless of the testing location.
What Happens If a Syphilis Test Is Positive During Pregnancy
When a person reads the word "syphilis" on a lab result while pregnant, the immediate reaction may be a frightening one. The person may think of the worst possible scenario right away. However, for a doctor who specializes in prenatal care, the situation is not as frightening as the patient thinks. The fact that the disease was detected early enough for treatment to take place is a good thing, which is the whole point of the screening tests to begin with.
A person can become infected with the disease if they are exposed to the bacteria that cause the disease. The majority of the tests for pregnant women check for antibodies in the mother's system that are a result of the bacteria that cause the disease. Once the first test is completed, a second test is usually administered to confirm the results of the first one before any treatment is initiated.
Once the results are confirmed, treatment can begin. The treatment for the disease when a person is pregnant is penicillin, which is a safe drug for the mother. The drug ensures that the disease is eliminated from the mother's system so that the bacteria do not get to the unborn child.
Fortunately, the treatment for the disease when a person is pregnant is very effective. Once the disease is detected and the treatment is initiated, the unborn child is not likely to get the disease. In fact, the unborn child may end up being perfectly healthy.
Another step that a person may go through after the disease is detected is the testing of the person's current partner. This is because the disease is spread through sexual intercourse, so the current partner should get tested as well so that the disease can be treated for them as well.
Why Early Detection Makes Such a Huge Difference
One of the most impressive things about prenatal medicine is the huge difference that can be seen when an infection is caught early. The key to dealing with syphilis while pregnant is timing. The sooner the treatment is started, the lower the risk that it will have any effect on the fetus.
There are many different scenarios that can be used to explain the way that syphilis is handled while pregnant. In one case, an individual is undergoing routine prenatal screening while in their first trimester. The results of the test are positive for an STD, so treatment is started immediately. The treatment is successful, and the STD is no longer present in the system before it is ever transmitted to the fetus. In another case, the individual does not have any routine screening done before they give birth. The STD is transmitted to the fetus because of the late detection.
The reason that physicians are so adamant about routine screening is that it eliminates all guesswork and gives them the medical data that they need to know what is going on. A blood test gives physicians the opportunity to treat an STD before complications even have a chance to develop. This is also one of the reasons that many different health care groups are pushing for universal screening for all pregnant women. Syphilis is an STD that can be silent for long periods of time. This means that an individual can have an STD without any signs or symptoms to point to anything unusual. Without routine screening, many people would never even know that they have an STD before they give birth to their child.
Because routine screening is so important for dealing with an STD while pregnant, some people are taking the opportunity to test themselves even before their first prenatal appointment. The ability to test for all 10 STDs with a discreet test like the Complete 10-Test STD Panel is an opportunity for people to have peace of mind while dealing with a new pregnancy.
People are also reading: What STDs Can Spread From Mouth to Genitals? The Oral Sex Risk Explained
Why Congenital Syphilis Has Become a Public Health Concern Again
For many decades, congenital syphilis had remained a rare occurrence in many parts of the world. This is mainly due to the widespread practice of prenatal screening. However, the recent increase in the prevalence of the disease in some areas of the globe has brought the importance of prenatal screening back into the spotlight.
The increased prevalence of the disease is not a result of a single factor. Rather, it is a combination of a number of factors. Some women may not seek prenatal care until later in the pregnancy. Others may not seek the necessary medical care due to the unavailability of such facilities.
The other factor contributing to the increased prevalence of the disease is the follow-up care. Once the infection is diagnosed, the patient may not seek the necessary medical care. Additionally, the patient may not be able to reach her partner to seek medical care. According to public health officials, the prevention of congenital syphilis is a multi-faceted approach.
In conclusion, the good news is that congenital syphilis is one of the most preventable diseases. When the prenatal screening is done on time and the necessary medical care is sought immediately, the baby is safe. According to medical practitioners, the prenatal screening of the mother is a safety net.
Most patients who undergo the screening will get a negative result. This will not affect them as they will just go on with their pregnancy without thinking much about the screening. However, the screening can change the whole outcome of the pregnancy for the small percentage of patients whose results are positive.
What Happens If a Syphilis Test Is Positive During Pregnancy
It is natural for a person, especially an expectant parent, to go into a panic when they see a medical report that includes the word "syphilis." Most people will instantly think of the worst-case scenario when they see that word, especially when they are expecting a child. In reality, a doctor who specializes in pregnant women will approach a case of syphilis in a very calm and organized fashion, as they are well aware of how easily and effectively they can treat it.
When a pregnant woman is tested for syphilis, most tests will check for antibodies in the blood that are a result of exposure to a bacterium called Treponema pallidum, which is what syphilis is caused by. If a woman tests positive on a first screening, a second test will usually be performed on a pregnant woman with syphilis. This second test will ensure that she does, in fact, have syphilis, and then she can begin treatment.
As soon as a woman is diagnosed with syphilis, she can begin treatment for it. The treatment for a pregnant woman with syphilis is a simple injection of penicillin, which is a well-known antibiotic that has been used for decades to cure syphilis, as well as many other infections, in pregnant women. The best part about penicillin is that it is safe for a pregnant woman as well as for a child who may be infected with syphilis.
The main goal of treating a pregnant woman with syphilis is to stop the infection before it reaches the child, as it will dramatically decrease the chances of congenital syphilis in a child if treatment is given in time, as most babies are born perfectly healthy when their mother is given treatment for syphilis.
Physicians will also give a pregnant woman with syphilis a second blood test, which will measure the levels of those same antibodies that were present in the first test. This will ensure that she is responding well to treatment and that she is no longer infected with syphilis.
Physicians will also give a pregnant woman with syphilis a test for a current partner, as a person with syphilis can easily pass it on if they are still infected, especially if they are still having sex with their partner throughout their pregnancy.
Why Congenital Syphilis Is Preventable With Modern Screening
One of the most frustrating things about public health is that congenital syphilis is mostly preventable, but it still happens. For decades, medical researchers have known that routine prenatal screening and timely treatment greatly lower the risk of infection in newborns.
Congenital syphilis happens when a pregnant woman passes the infection on to her baby through the placenta. If left untreated, the bacteria can stop the fetus from growing properly. But if the infection is found and treated early, the risk of spreading it goes down a lot.
The reason doctors stress screening so much is that once the infection is found, it's very easy to stop it from spreading. A typical course of antibiotics during pregnancy is usually enough to stop the spread of the disease completely.
Sometimes, public health agencies say that more cases of congenital syphilis are being reported. However, these spikes are usually due to people not being able to get the care they need, not because the treatment didn't work. If you miss prenatal appointments, don't get care during late pregnancy, or don't get screened, infections can go undetected until delivery.
This is why universal screening is still the most important part of prevention. Most people who take the test will get a negative result and not think about it again. But for the small number of people whose test comes back positive, that routine screening can make a big difference in their baby's life.
FAQs
1. Why do doctors test for syphilis during pregnancy?
Syphilis is tested for during pregnancy because this disease can be passed on from parents to their unborn baby even before birth. This allows for antibiotics that prevent this infection in the unborn baby, thus maintaining their health.
2. Is syphilis testing routine during pregnancy?
Yes, syphilis is routinely tested for during pregnancy in most health systems, where it is part of routine blood tests during the first prenatal visit.
3. Can syphilis harm a baby in the womb?
Syphilis can be passed on from parents to unborn babies if not treated in time, which can cause problems during pregnancy or even after birth if not checked. However, this is preventable if treatment is given in good time.
4. What kind of test is used for prenatal syphilis screening?
A blood test is used to check for syphilis during pregnancy. This is when the body makes antibodies to fight the infection.
5. What happens if a pregnant person tests positive for syphilis?
The infection can be treated by doctors using penicillin, an antibiotic that effectively eliminates the bacteria from the body. The treatment during pregnancy greatly reduces the possibility of infecting the child.
6. Do partners need to be tested if syphilis is found during pregnancy?
Yes. The partners should be tested and treated if necessary. The reason for this is to avoid future infections during pregnancy.
7. Can the symptoms of syphilis appear during pregnancy?
Sometimes, but not all. The symptoms can appear in the form of a painless sore and a rash. Not everyone can notice the symptoms. That is why the only way to identify the condition is through a test.
8. Is congenital syphilis common today?
It is rare in many places due to prenatal tests. The condition can still appear if the infection is not detected early. It can also appear if prenatal tests are delayed.
9. Can someone test for syphilis before their prenatal visit?
Yes. People can choose to do a test before going for a prenatal visit. The reason for this is to have peace of mind. People can use a clinic or a private company that offers at-home tests.
10. How can congenital syphilis be prevented?
The only way to prevent the condition is to have prenatal tests and treatment if necessary. The tests can help doctors to stop the infection before it reaches the child.
Testing, Treatment, and Peace of Mind During Pregnancy
Most people forget about the long list of blood tests by the time they leave their first prenatal appointment. But one of those routine checks, the one for syphilis, quietly saves thousands of babies every year. The reason doctors keep pushing this test is simple: if the infection is found early, treatment almost always stops it from spreading to the baby.
That's why routine screening is such a big part of prenatal care and not just looking for symptoms. Someone can have syphilis while pregnant and not show any signs of it. A quick blood test lets doctors act quickly to protect the baby's growth and avoid problems that could happen later.
In recent years, there have been more testing options for people who are pregnant but don't always have access to a clinic. People can use private screening services and home kits to confirm their status before or between medical visits. When people want to get tested for STDs in a private way that fits their schedule, they often choose STD Test Kits.
How We Sourced This: We wrote our article using the most up-to-date advice from the best public health and medical groups. Then, we changed it into simple language based on real-life situations, like treatment, getting reinfected by a partner, being exposed to someone with no symptoms, and the awkward question of whether it "came back." We had a lot of different public health advice, clinical advice, and medical references in the background of our research, but the following are the most relevant and helpful for readers who want to check our claims for themselves.
Sources
1. World Health Organization – Syphilis Fact Sheet
2. Mayo Clinic – Syphilis Overview
4. CDC: About Congenital Syphilis
5. CDC: About STIs and Pregnancy
About the Author
Dr. F. David, MD is a board-certified infectious disease specialist who focuses on preventing, diagnosing, and treating STIs. He writes in a straightforward, sex-positive, and stigma-free way that helps readers get clear answers without getting stuck in a panic spiral.
Reviewed by: Rapid STD Test Kits Medical Review Team | Last medically reviewed: March 2026
This article is for informational purposes and does not replace medical advice.