High-Risk Pregnancy

Symptoms

• Vaginal bleeding
• Leaking of fluid from the vagina
• Sudden or severe swelling in the face, hands, or legs
• Severe headache that is persistent or accompanied by visual disturbances (blurred vision, flashing lights, spots)
• Epigastric or right upper quadrant pain
• Decreased or absent fetal movement (after approximately 24-28 weeks gestation)
• Painful contractions before 37 weeks that are regular and increasing in frequency/intensity
• Fever or chills
• Pain or burning during urination
• Persistent nausea and vomiting (hyperemesis gravidarum)

Causes & Risk Factors

• The 'cause' of a high-risk pregnancy is typically an underlying risk factor itself, such as a pre-existing medical condition or a complication that develops during pregnancy. Many high-risk conditions are multifactorial, meaning they result from a complex interplay of genetic predisposition, maternal health status, environmental exposures, and placental biology. For some conditions, like preeclampsia, the exact causal pathway is still being investigated, though placental dysfunction is considered central.
• Maternal Age: Advanced maternal age (over 35 years) or adolescent pregnancy (under 17 years)
• Obstetric History: Previous high-risk pregnancy, including history of preterm birth, preeclampsia, stillbirth, recurrent pregnancy loss, or cesarean delivery
• Multiple Gestation: Carrying twins, triplets, or more
• Genetic Factors: Personal or family history of genetic conditions; fetal chromosomal abnormalities
• Race and Ethnicity: Certain racial and ethnic groups have higher risks for specific conditions (e.g., higher rates of preeclampsia and preterm birth among Black women)
• Pre-existing Medical Conditions: Chronic hypertension, Type 1 or Type 2 diabetes, obesity (BMI ≥30) or being underweight (BMI <18.5), autoimmune diseases (e.g., lupus, rheumatoid arthritis), thyroid disease, heart, lung, or kidney disease, infectious diseases (e.g., HIV, Hepatitis C), mental health conditions (e.g., depression, anxiety)
• Lifestyle Factors: Tobacco use, alcohol consumption, substance abuse
• Pregnancy-Acquired Risk Factors: Gestational Diabetes Mellitus (GDM), Hypertensive Disorders of Pregnancy (Preeclampsia, eclampsia, HELLP syndrome, gestational hypertension), Placental Issues (Placenta previa, placental abruption, placenta accreta spectrum), Fetal Conditions (Fetal growth restriction (FGR), macrosomia, fetal anomalies, abnormal amniotic fluid levels)

Diagnosis

• Medical History: Review of chronic conditions, medications, past surgeries, outcomes of previous pregnancies, family history of genetic disorders, preeclampsia, or diabetes, and social history including lifestyle factors and support systems.
• Physical Examination: Baseline and serial blood pressure measurements, maternal weight and height (for BMI calculation), fundal height measurement to assess fetal growth, and assessment for edema.
• Laboratory Tests: Standard antenatal labs (blood type, Rh status, antibody screen, CBC, rubella immunity, syphilis, Hepatitis B, and HIV screening), targeted labs (urine protein for preeclampsia screening, glucose tolerance test for gestational diabetes, thyroid function tests), and genetic screening/testing (cell-free DNA, nuchal translucency, chorionic villus sampling, amniocentesis).
• Imaging: Ultrasound for detailed anatomy scans (~18-22 weeks), serial growth scans, cervical length measurement, and placental location assessment.
• Fetal Surveillance: Biophysical Profile (BPP) which is an ultrasound assessment of fetal breathing, movement, tone, and amniotic fluid volume, often combined with a nonstress test. Doppler ultrasound assesses blood flow in the umbilical artery and other fetal vessels to evaluate placental function and fetal well-being.

Treatment Options

• Lifestyle Modifications: Counseling for appropriate weight gain and specific diets (e.g., for gestational diabetes), modified physical activity as appropriate, and counseling and support for stopping tobacco, alcohol, and drug use.
• Pharmacotherapy: Management of chronic conditions (e.g., antihypertensives, insulin), low-dose aspirin for preeclampsia prophylaxis in high-risk individuals, progesterone to prevent preterm birth in select patients (e.g., short cervix, prior preterm birth), antenatal corticosteroids to promote fetal lung maturity if preterm birth is anticipated, and magnesium sulfate for seizure prophylaxis in severe preeclampsia and for fetal neuroprotection in imminent preterm birth (<32 weeks).
• Surgical Interventions: Cervical cerclage (a stitch placed in the cervix to prevent premature opening in cases of cervical insufficiency), and highly specialized invasive fetal therapy for certain fetal anomalies (e.g., twin-twin transfusion syndrome).
• Surveillance / Watchful Waiting: Increased frequency of antenatal visits, enhanced maternal and fetal monitoring (e.g., home blood pressure monitoring, frequent blood glucose checks, serial ultrasounds, nonstress tests, Biophysical Profiles).
• Referral Indications: Referral to a Maternal-Fetal Medicine (MFM) specialist is common, and multidisciplinary care involving other specialists (e.g., endocrinologist, cardiologist, neonatologist) is often required.

Frequently Asked Questions