Impact of the new test
The National Institute of Health states that preterm babies born from preeclamptic mothers can suffer many health problems including cerebral palsy, deafness, blindness, epilepsy, and a host of other respiratory, cardiovascular, and endocrine issues. But the biggest issue is preterm birth, defined as birth before 37 weeks gestation. Being born preterm can require a long stay in the intensive care nursery.
This is where the first-of-its-kind prognostic blood test comes into play. The test’s ability to predict severe preeclampsia within 2 weeks can help save lives. The test can offer health care providers the ability to administer steroids for fetal lung maturity before delivery and be more prepared to care for what could be a very compromised newborn.
The blood test, which is recommended between 23-35 weeks gestation, involves analyzing a ratio between two proteins from the placenta, sFlt1 and PIGF. The higher the ratio, the higher the risk that severe preeclampsia will develop. Results can be available within 30 minutes, which is critical when contemplating treatment.
An example of the use of this ratio is illustrated with chronic hypertension in pregnancy, which is defined as elevated blood pressure before 20 weeks or even before conception. Since chronic hypertension can be a primary precursor to preeclampsia, patients with this condition are at higher risk. The FDA-approved blood test would be helpful in determining the plan of care; that is, delivery versus hospitalization versus monitor as an outpatient.
With a positive test result, a pregnant woman can be immediately hospitalized where she can get the care she and baby need as they await delivery. Since health care providers already know the high-risk groups, surveillance can begin early, utilizing this blood test to predict the progression to severe preeclampsia. Conversely, if the test is negative, a treatment plan can be made as an outpatient and the pregnancy continues.
Not all hospitals are equipped to care for premature babies. If delivery is not imminent, providers can use this blood test to identify those that should be transferred to a tertiary center for observation and monitoring. Mother and baby would then not be separated after birth.
We really don’t know who will develop severe preeclampsia and who won’t. This new blood test will be a critical tool as pregnant patients go through their second and third trimesters. It will be especially pivotal for these women, but important for all pregnant women in reducing maternal and fetal mortality and morbidity.
Ms. Barnett is a registered nurse in the department of obstetrics, Mills-Peninsula Medical Center, Burlingame, Calif. She has disclosed no relevant financial relationships.