Pregnancy is not always a smooth sail, but in the case of certain women, the stakes are even higher. A high-risk pregnancy is not an indication that something will happen. It implies that some factors, such as pre-existing conditions, age, multiple gestations, and complications occurring during pregnancy, will need to be monitored more carefully, assessed more often, and require a more prepared care team that can handle a wider variety of outcomes.

Knowledge of what constitutes a high risk pregnancy and the measures that can be taken to ensure a better outcome than a typical pregnancy would allow women and their families to enter the process with a better grasp of it and less fear.

What makes a pregnancy high-risk?

High-risk pregnancy conditions are divided into three broad categories: health problems in the mother that are experienced prior to pregnancy, health problems that arise during pregnancy and health problems that affect the fetus.

Preexisting conditions that put a pregnancy in the high-risk category are diabetes, high blood pressure, heart disease, kidney disease, autoimmune diseases such as lupus, thyroid diseases, and a history of previous pregnancy complications such as preterm birth, frequent miscarriage, or previous caesarean delivery. Significantly underweight or overweight women before conception have high risks, as well as those who conceive after 35 years of age or before 17 years of age.

Pregnancy-related conditions that increase risk include gestational diabetes, gestational hypertension and preeclampsia, fetal growth restriction, and placenta-related conditions, including placenta previa and placental abruption. Multiple pregnancies (twins, triplets, etc.) are nearly always considered high-risk due to the considerably high preterm birth rates, low birth weight, and other complications of having more than one baby in the womb.

Preeclampsia and blood pressure

Hypertension in pregnancy, such as gestational hypertension, preeclampsia, and eclampsia, is a significant cause of maternal and fetal morbidity and mortality. These conditions have a prevalence of between 5 and 10 per cent in pregnancies, and preeclampsia can cause up to 14 per cent of maternal deaths worldwide.

Preeclampsia occurs after 20 weeks of pregnancy and is characterised by high blood pressure and protein in the urine, and may involve the liver, kidney and brain. It can develop rapidly, so there is no compromise in blood pressure assessment at each antenatal visit in high-risk pregnancies. Pregnant women with chronic hypertension need to be closely monitored and blood pressure controlled during pregnancy because uncontrolled high blood pressure can lead to placental abruption, preterm birth, and fetal undergrowth.

Gestational diabetes

Gestational diabetes increases the risk for further maternal and fetal complications, including preeclampsia, the need for caesarean delivery, preterm delivery, and macrosomia, where the baby grows significantly larger than average. The increased risk is correlated directly with how well blood glucose is controlled during pregnancy.

Women with gestational diabetes require regular blood glucose monitoring, dietary modification supervised by a dietitian, and in some cases, insulin therapy to keep levels within a safe range. Poorly controlled gestational diabetes carries risks for the baby, including low blood sugar at birth, jaundice, and, in some cases, stillbirth when management has been inadequate.

Key high-risk pregnancy precautions

The difference between a well-managed high-risk pregnancy and one with poor outcomes often comes down to how consistently precautions are followed and how early problems are identified.

More frequent antenatal visits are the cornerstone of high-risk pregnancy management. Where a low-risk pregnancy may involve monthly appointments in the first two trimesters, a high-risk pregnancy often requires fortnightly or even weekly monitoring depending on the specific risk factors involved. With each visit, it is possible to intervene before increasing blood pressure, abnormal glucose levels, or fetal growth restriction.

Monitoring the fetus with routine ultrasounds assesses fetal development, amniotic fluid volume, and blood circulation via the umbilical cord. A baby that is not growing as expected, or where blood flow measurements suggest placental insufficiency, may need to be delivered earlier than planned. Identifying this through monitoring allows delivery to be planned in a controlled setting rather than as an emergency.

Women with pre-existing disease in pregnancy who wish to continue with the pregnancy require extra medical care, often from an interdisciplinary team that may include an obstetrician, a specialist in the underlying disorder, maternal-fetal medicine specialists, and dieticians.

For women with heart disease, kidney disease, or autoimmune conditions, the management of the underlying condition needs to be optimised before conception if possible, and maintained throughout pregnancy in close collaboration between the obstetrician and the relevant specialist.

Lifestyle precautions that matter

Beyond medical monitoring, certain lifestyle factors significantly affect pregnancy outcomes in high-risk pregnancies. Maintaining weight gain within the range recommended by the obstetric team helps avoid compounding existing metabolic risks. A diet designed to manage blood sugar, blood pressure, and nutritional adequacy matters more in a high-risk pregnancy than in one without complicating factors.

Rest is important, but needs to be balanced appropriately. Complete bed rest is rarely recommended as a blanket measure and can increase the risk of blood clots. The specific activity level that is safe depends on the nature of the risk and should be discussed directly with the obstetric team.

Attending every scheduled appointment, reporting new or worsening symptoms promptly, and having a clear plan for when and where to present in an emergency are all practical pregnancy complications precautions that the antenatal team should discuss explicitly with every high-risk patient.

Takeaways

High-risk pregnancy requires a higher level of monitoring, a more structured care team, and a greater degree of personal vigilance from the mother than a low-risk pregnancy. The most common high-risk conditions include pre-existing diabetes, hypertension, autoimmune disease, obesity, advanced maternal age, and complications that develop during pregnancy, such as preeclampsia and gestational diabetes.

High risk pregnancy precautions centre on frequent antenatal monitoring, specialist input from maternal fetal medicine where needed, careful management of underlying conditions, and prompt reporting of any new symptoms. With the right care in place, the majority of women with high-risk pregnancies deliver healthy babies.