These days, blood test has gradually been popular for pregnant women. However, there are still a lot of questions related to it: Are the results reliable? Does blood tests hurt? What are the pros and cons? To answer these questions, we will show you basic information about blood test: What is it? How it works? So that you would well prepare for your pregnancy.


​What is a blood test in pregnancy?

​A blood or serum test in pregnancy is an examination that helps to determine the accurate amount of hCG (human chorionic gonadotropin) and other types of hormone in the blood. hCG is a form of hormone in pregnant women, which is generated by the placenta. It would be detected in the urine and blood during ten days of fertilization.

​Therefore, the main purpose of a blood test is to tell if you are pregnant or not based on the amount of hCG. So if you notice any signs of pregnancy such as vomiting, uneven spotting, pain in the pelvis, breast tenderness and delay in menstrual period, immediately take a blood test to fully understand the situation.

​In general, there are 2 forms of blood test in for pregnancy, including qualitative test that tells a woman if she is pregnant or not and quantitative test that determines the accurate amount of hCG in your blood.

​What would a blood tests provide you?

​In fact, blood test is a routine task of prenatal care in your pregnancy. Whenever you go book an appointment with your doctor or midwife, they would possibly offer you to take a blood test. This is often to examine if your kid has any abnormalities or if you have any diseases or infections check.

​It is completely normal to worry about a blood test, but it would offer your doctor or midwife and you essential information and figures about your health. In addition, it would also determine any possible health problems during the pregnancy.

​Blood group

​It is important to know your blood group if you need to be transfused during delivery or pregnancy. In general, the most common blood is O and groups AB, A and B are less commons.

​Rhesus factor (Rh)

​If you are rhesus positive, it means that you have a certain protein in the red blood cells. Otherwise, if you are rhesus negative, then you do not.

​If your husband is rhesus positive and you are rhesus negative, there is a potential possibility that your kid would be positive. In this situation, your body might generate antibodies which begins to attack red blood cells of your kid. You would keep this problem from happening by injecting immunoglobulin.

​Levels of haemoglobin

​A blood test could also show if you have low levels of haemoglobin, which would be a symptom of anaemic iron deficiency

​In general, your body would need iron to generate haemoglobin for carrying oxygen around the red blood cells. If you suffer from anaemia because of iron deficiency, a midwife or doctor would suggest you to look for the most suitable foods for providing iron. In addition, you would also be prescribed iron tablet since this would be the best method to treat anaemia during pregnancy.

​After 28 weeks, your levels of haemoglobin will be examined again. If you carry twins or feel extremely tired, your doctor would arrange a blood test for you earlier to check whether you are anaemic.

​Hepatitis B

​A blood test would be usually the only method to be sure whether you are carrying virus hepatitis B. When you pass on this form of virus to your kid after or before she is born, she would need to be defended by the injections of antibodies or vaccine. As your kid is 1 year old, a blood test is often used to determine if he or she has avoided this virus.


​In fact, syphilis – a sexually transferred disease - is quite rare these days. Nevertheless, if you are facing with it and do not treat it suitably during your pregnancy, your kid would have a couple of fetal abnormalities. More seriously, syphilis could also make your kid to be stillborn.

​In times, a blood test to check syphilis could provide a wrong positive result mainly because it' is quite difficult to discriminate between the bacteria which leads to syphilis and the same other ones which often lead to non-sexually transferred diseases.

​If you are diagnosed as syphilis, then you would be treated by using penicillin. It might be enough to keep your kid from the virus, even though some children require antibiotics right after their birth.

​Pros and cons of a blood test


  • This test could find out if you are pregnant earlier than a urine test for at least 1 or 2 weeks.
  • It could calculate the amount of hCG hormone in the blood, which is really helpful for a doctor in detecting several problems during pregnancy.


  • A blood test, which depends on the expenses of lab fee and doctor’s visit, is often costlier than a urine test
  • It would take you a long time to have the result
  • It needs to be performed in the office of a doctor

Nancy D. Richardson

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