Pregnancy Third Trimester (28 weeks to delivery)

Third Trimester Pregnancy Lab Tests and health information

Find the right blood test during pregnancy third trimester with Ulta Lab Tests to screen for and monitor your health. Get an accurate test results sent confidentially online in 24 to 48 hours. Order from Ulta Lab Tests today! 


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For women who engage in high-risk activities, such as intravenous drug use or unprotected sexual contact that can contribute to HIV or hepatitis B infection, it is highly advised that these women test for these infections during the third trimester of their pregnancies. Further, it is highly recommended (in fact, required in some states) to test or repeat the tests for sexually transmitted diseases such as syphilis, gonorrhea, and chlamydia in the third trimester. 

A non-stress test (NST) may also be given to pregnant women. This is a non-invasive test performed after the 28th week to monitor health and look for indications of distress in high-risk pregnancies or babies past due. The test also measures the fetal heart rate concerning movement.  

When healthcare practitioners are concerned about how contractions affect fetal heart rate, what is known as a contraction stress test may be performed following the stress test. The process involves medication ... See more

Pre-eclampsia is among the more severe conditions that can impact women who are pregnant. This condition is diagnosed when a pregnant woman displays three different factors. The first is hypertension or high blood pressure. The second is proteinuria or protein in the urine output, and the third is swelling of her feet, hand, and/or face. In the most serious cases, there might even be evidence of liver and kidney damage, fluid accumulation in the lungs, and central nervous system disturbances. Pre-eclampsia rates among pregnant women range from 3 up to 7 percent, and it typically happens after week 20 of the pregnancy. 

Untreated pre-eclampsia can be very risky since it might hurt the physical organs of the mother’s body and also result in seizures. These seizures are known as eclampsia. If not treated immediately, they are typically fatal for both the mother and child. Both pre-eclampsia and eclampsia can result in premature delivery and ... See more