Pregnancy is a time when regular health check-ups become important for both the mother and the developing baby. Different tests are recommended at different stages of pregnancy to monitor the baby’s growth and identify conditions such as anemia, diabetes, infections, high blood pressure, or other complications at an early stage. The exact tests may vary depending on the mother’s health, medical history, age and pregnancy risk factors.
1. First 3 Months: 0–12 Weeks
As soon as pregnancy is confirmed, the first antenatal check-up should be scheduled. Doctors generally recommend basic blood and urine tests, including hemoglobin, blood group and Rh factor, blood sugar and urine examination.
Screening for infections such as HIV, syphilis and hepatitis B is also important during early pregnancy. An early ultrasound may be recommended to confirm the pregnancy’s location, estimate gestational age and check the number of babies.
Depending on the pregnancy and medical history, doctors may also recommend first-trimester screening for certain chromosomal conditions.
2. Fourth Month: 13–16 Weeks
During this period, regular antenatal visits continue. Blood pressure, weight, urine and the baby’s development are monitored.
If an earlier screening test was not performed or if the doctor considers it necessary, additional prenatal screening may be recommended during this period.
3. Fifth Month: 17–20 Weeks
One of the important scans during pregnancy is the detailed anomaly scan, generally performed around 18–22 weeks.
This ultrasound examines the baby’s anatomy and development and checks for certain structural abnormalities. It is an important part of routine prenatal care.
4. Sixth Month: 21–24 Weeks
Regular antenatal monitoring continues during this stage. Doctors may check blood pressure, urine, weight and fetal growth.
Depending on the mother’s health and previous test results, additional blood tests may be advised.
5. Seventh Month: 24–28 Weeks
The gestational diabetes test is particularly important during this period. Doctors commonly use blood glucose testing or an oral glucose tolerance test to check whether pregnancy-related diabetes is present.
A repeat hemoglobin test may also be recommended to check for anemia.
6. Eighth Month: 29–32 Weeks
During the third trimester, antenatal visits become increasingly important. The doctor monitors blood pressure, urine, baby’s growth, fetal movements and other signs of possible complications.
Additional ultrasound or fetal monitoring may be recommended if there is a medical reason or concern about the baby’s growth.
7. Ninth Month: 33–36 Weeks
As delivery approaches, doctors continue monitoring the mother’s blood pressure, baby’s position and growth, fetal movements and overall pregnancy health.
If the mother has an Rh-negative blood type, the doctor may assess whether anti-D treatment is required.
In some healthcare settings, Group B Streptococcus (GBS) screening is performed around 35–37 weeks.
8. 37–40 Weeks: Preparing for Delivery
During the final weeks, check-ups may become more frequent. The doctor assesses the baby’s position, fetal movements, maternal blood pressure and other signs that can affect delivery.
Additional tests such as ultrasound or fetal monitoring may be recommended when medically indicated. The doctor also discusses the delivery plan and what symptoms require immediate medical attention.
Month-by-Month Pregnancy Test Guide
| Pregnancy Stage | Important Tests/Monitoring |
|---|---|
| 0–12 weeks | Blood group/Rh, hemoglobin, blood sugar, urine test, HIV, syphilis, hepatitis B, early ultrasound |
| 13–16 weeks | Regular antenatal check-up and additional screening if required |
| 18–22 weeks | Detailed anomaly ultrasound |
| 21–24 weeks | Routine maternal and fetal monitoring |
| 24–28 weeks | Gestational diabetes screening, repeat anemia testing if advised |
| 29–32 weeks | Growth and routine third-trimester monitoring |
| 35–37 weeks | GBS screening in settings where it is recommended |
| 37–40 weeks | Frequent antenatal monitoring and delivery planning |
Important Note
Not every pregnant woman needs every test listed above. The testing schedule can change depending on factors such as age, previous pregnancy complications, diabetes, high blood pressure, thyroid problems, anemia, multiple pregnancy or other medical conditions.
Pregnant women should therefore follow the schedule recommended by their gynecologist rather than relying only on a general month-by-month chart. Timely prenatal testing can help doctors identify potential problems early and provide appropriate care for both mother and baby.
