Introduction: Who Should Consider Labor Induction

Labor induction is recommended when healthcare providers determine that the benefits of delivering the baby outweigh the risks of continuing the pregnancy. The decision to induce labor is not taken lightly and involves careful evaluation of both the pregnant person’s health and the baby’s wellbeing.^[1] In high-income countries, approximately one in four pregnancies involves labor induction, a rate that has nearly doubled since 1990.^[5]

You should undergo diagnostic evaluation for possible labor induction if you reach 41 weeks of pregnancy without going into labor naturally. At this point, there is an increased risk of stillbirth or problems for the baby, as the placenta may not work as effectively once you pass 41 to 42 weeks.^[1][3] Healthcare providers will assess several factors including your overall health, any medical conditions you may have, the baby’s health and size, how much amniotic fluid surrounds the baby, and the position of the baby in your uterus.^[1]

It is advisable to seek diagnostic evaluation and discuss induction if you have certain medical conditions that develop during pregnancy. These include gestational diabetes (diabetes that develops during pregnancy), high blood pressure, or preeclampsia (a serious pregnancy complication characterized by high blood pressure and signs of damage to other organs).^[2] If you had diabetes before becoming pregnant and use medication to control it, your provider may suggest delivery by 39 weeks, sometimes earlier if diabetes is not well controlled.^[1]

Another situation requiring evaluation is when your water breaks but labor does not begin on its own. When the amniotic sac ruptures more than 24 hours before labor starts, there is an increased risk of infection to both you and your baby, a condition called premature rupture of membranes.^[2][3] If your waters break after 34 weeks of pregnancy, you will typically be offered the choice between induction or careful monitoring while waiting for labor to start naturally.^[3]

You should also be evaluated if there are concerns about the baby’s growth or wellbeing. This includes situations where the baby is not growing as expected, called fetal growth restriction, or when there is too little amniotic fluid surrounding the baby, known as oligohydramnios.^[1][2] Problems with the placenta, such as when it begins to separate from the uterine wall (placental abruption), or an infection in the uterus called chorioamnionitis, also warrant evaluation for possible induction.^[2]

Recent research has also explored elective induction, which means choosing to induce labor for non-medical reasons. Studies show that for healthy women at 39 weeks in their first full-term pregnancy, elective induction may reduce the risk of cesarean birth and lower rates of pregnancy complications like preeclampsia.^[4] However, the American College of Nurse-Midwives continues to recommend waiting for spontaneous onset of labor in the absence of complications.^[5] If you are considering elective induction, your hospital must have adequate staff and resources to support this option, and you should discuss all benefits and risks thoroughly with your healthcare provider.^[4]

Diagnostic Methods to Determine Need for Induction

Before recommending labor induction, healthcare providers use several diagnostic methods to evaluate whether induction is necessary and when it should occur. These assessments help ensure that the decision is based on solid medical evidence and that both the pregnant person and baby are ready for delivery.

Physical Examination and Cervical Assessment

One of the most important diagnostic tools is the physical examination of the cervix. Your healthcare provider will perform a vaginal examination to check whether your cervix has begun preparing for labor. The cervix needs to soften (a process called ripening), thin out (called effacement), and open (called dilation) for labor to progress successfully.^[2] These changes usually start a few weeks before labor begins naturally, but when induction is being considered, providers need to know the current state of the cervix.^[11]

To rate the readiness of the cervix for labor, many healthcare providers use the Bishop score. This scoring system assigns a number ranging from 0 to 13 based on several factors including how dilated the cervix is, its texture (soft or firm), its position, its length, and where the baby’s head is positioned in the pelvis.^[4] A Bishop score of less than 6 typically means that your cervix may not be ready for labor and will likely need ripening before or during the induction process.^[4] This score helps your provider determine the best method of induction for your specific situation.^[7]

Monitoring the Baby’s Health

Assessing the baby’s wellbeing is crucial when deciding whether induction is needed. Healthcare providers will estimate the baby’s gestational age (how far along the pregnancy is), weight, size, and position in the uterus through physical examination and imaging.^[1] These measurements help determine whether the baby is growing appropriately or if there are concerns about growth restriction that might make earlier delivery safer.

Ultrasound examinations play a key role in evaluating the baby before induction. Providers use ultrasound to measure the amount of amniotic fluid surrounding the baby. Too little fluid (oligohydramnios) can be a sign that the placenta is not functioning optimally and may indicate the need for delivery.^[1] Ultrasound also helps assess the placenta’s position and condition, checking for problems such as placental abruption or other abnormalities that would necessitate delivery.^[1]

In some cases, more specialized ultrasound assessments may be used, such as Doppler studies that evaluate blood flow to the baby. These tests are particularly important when there are concerns about fetal growth restriction. For instance, if Doppler ultrasound shows absent or reversed blood flow in certain vessels, this indicates the baby may not be getting adequate oxygen and nutrients, prompting earlier delivery timing.^[5]

Maternal Health Assessment

Evaluating the pregnant person’s health is equally important in determining the need for induction. Blood pressure measurements are routinely taken at prenatal visits, and elevated readings can indicate conditions like gestational hypertension or preeclampsia. When high blood pressure develops, providers may recommend induction at 37 weeks of gestation or at the time of diagnosis if it occurs later.^[5]

Laboratory tests help diagnose conditions that may warrant induction. Blood tests can identify gestational diabetes, kidney disease, or signs of preeclampsia such as abnormal liver function or low platelet counts. Urine tests may reveal protein in the urine, another sign of preeclampsia, or urinary tract infections that could pose risks if the pregnancy continues.^[1] For pregnant people with diabetes, blood glucose monitoring throughout pregnancy helps providers determine the optimal timing for delivery, typically around 39 weeks if diabetes is well controlled with diet, or between 36 and 39 weeks if medication is required or control is poor.^[5]

Dating the Pregnancy

Accurately determining how far along the pregnancy is represents a critical diagnostic step. Healthcare providers use the date of your last menstrual period combined with early ultrasound measurements to establish an estimated due date. This information is essential because induction recommendations are based on gestational age. At 42 weeks from the day of the last period, a pregnancy is considered postterm, and the risks of continuing increase significantly.^[1] Most providers will offer induction if you have not gone into labor naturally by 41 weeks.^[3]

Assessment of Rupture of Membranes

When there is uncertainty about whether the amniotic sac has ruptured, healthcare providers can perform tests to confirm. These may include visual examination with a speculum to look for amniotic fluid leaking from the cervix, testing the pH of vaginal fluid (amniotic fluid is less acidic than normal vaginal secretions), or using specialized swabs that detect proteins found only in amniotic fluid. Confirming rupture of membranes is important because if labor does not begin within about 24 hours after the water breaks, the risk of infection increases and induction is typically recommended.^[2]

Understanding the Induction Methods and Procedures

Once the decision to induce labor has been made based on diagnostic findings, healthcare providers use various methods to start the process. The specific approach depends on the condition of your cervix, how far along you are in pregnancy, and your individual medical situation. Understanding these methods can help reduce anxiety about what to expect.

Cervical Ripening Techniques

If your cervix is not yet ready for labor—meaning it is still firm, long, and closed—the first step is usually to help it ripen. Several methods can accomplish this. One common approach involves medications called prostaglandins, which are hormones that naturally help soften and thin the cervix. These can be given as a gel applied directly to the cervix, as a vaginal insert or suppository, or as tablets placed in the vagina or taken by mouth.^[2][8] After receiving prostaglandins, you may need to wait several hours or even days for the cervix to ripen enough for labor to begin.^[3]

Another cervical ripening method involves mechanical devices. A balloon catheter, such as a Foley catheter, consists of a narrow tube with a small balloon on the end. The healthcare provider inserts it through the cervix and then inflates the balloon. This physical stretching helps the cervix begin to open. The catheter typically stays in place until the cervix has dilated to about 3 centimeters, at which point the balloon usually falls out on its own.^[8] Some research suggests that combining a balloon catheter with prostaglandin medication may shorten the time to delivery.^[10]

A procedure called membrane sweeping or stripping may be offered before formal induction begins. During a vaginal examination, your healthcare provider sweeps a gloved finger around your cervix, separating the amniotic sac membranes from the cervix. This action triggers your body to release natural prostaglandins, which may help start labor on its own.^[8] Membrane sweeping is typically offered after 39 weeks of pregnancy. While some people find this procedure uncomfortable or even painful, and cramping or light vaginal bleeding afterward is common, there is evidence that it can increase the likelihood of going into spontaneous labor within 48 hours.^[3]

Methods to Stimulate Contractions

Once the cervix has begun to ripen or if it was already favorable, the next step is usually to stimulate regular contractions. The most common method uses a synthetic version of the natural hormone oxytocin, given through an intravenous (IV) line. This medication, often known by the brand name Pitocin, causes the uterus to contract.^[2][7] The dosage is carefully controlled and can be adjusted up or down depending on how you and the baby are responding. Throughout this process, healthcare providers monitor both your contractions and the baby’s heart rate to ensure safety.^[2]

Another technique to help progress labor is artificial rupture of membranes, often called “breaking the water.” Using a small plastic hook during a vaginal examination, your provider makes a small opening in the amniotic sac. This should only be done after the cervix has started to open and the baby’s head is firmly positioned low in the pelvis.^[8] Breaking the water may help contractions become stronger and more regular, potentially speeding up labor. However, once the membranes are ruptured, there is an increased focus on ensuring labor progresses, as the risk of infection rises the longer the baby remains in the uterus after the water breaks.^[8]

What Happens During the Induction Process

Labor induction always takes place in a hospital maternity unit where you can be closely monitored by midwives and have doctors available if needed.^[3] On your scheduled induction day, you will be admitted to the birth center. Your care team will review which methods they think are best for your situation and explain what to expect.^[7]

The timeline for induction varies considerably from person to person. With the use of medications or other techniques, active labor can start quickly for some people, but for others it may take hours or even days.^[7] Healthcare providers typically advise expecting at least 24 hours from the start of induction until delivery.^[7] You will usually stay in the hospital maternity unit during this time, though in some situations you may be able to go home temporarily and return later.^[3]

In cases where the first approach to induction does not result in progressive labor, your provider may try a different method or a combination of techniques. If labor still does not progress after multiple attempts and both you and the baby are doing well, you might be sent home to try again another day. However, if either you or the baby shows signs of distress or if labor has not advanced after 24 hours or more of active induction attempts, a cesarean delivery (C-section) may become necessary.^[7][3] While the possibility of needing a C-section can sound concerning, it is important to know that cesarean births are very common and safe procedures when needed.^[7]

Special Considerations and Monitoring

Throughout the labor induction process, continuous assessment helps ensure safety for both the pregnant person and baby. Healthcare providers use various monitoring techniques to watch how labor is progressing and to detect any potential problems early.

Continuous Monitoring During Induction

When you are being induced, your healthcare team will monitor the baby’s heart rate and your contractions more closely than during spontaneous labor. This typically involves continuous electronic fetal monitoring, where sensors placed on your abdomen track the baby’s heartbeat and the frequency and strength of your contractions. This information helps providers ensure the baby is tolerating labor well and adjust medications if contractions become too strong or too frequent.^[2]

Your vital signs, including blood pressure, pulse, and temperature, will be checked regularly throughout the induction. If you have a medical condition like high blood pressure or diabetes, these measurements help your care team watch for any changes that might require intervention. You will also have an IV line in place, both to give medications like oxytocin and to provide fluids and other treatments quickly if needed.^[2]

When Induction Should Not Be Used

There are certain situations where labor induction would be unsafe and is not recommended. Some conditions make a vaginal delivery dangerous for you or your baby, requiring a planned cesarean birth instead. These situations include placenta previa, where the placenta covers the opening of the uterus; when the baby is lying sideways (transverse position) or bottom-first (breech presentation); when there is a prolapsed umbilical cord (the cord has dropped into the vagina ahead of the baby); or if you have an active genital herpes infection.^[11]

Previous uterine surgery can also make induction risky. If you have had certain types of cesarean birth or surgery to remove fibroids (benign growths in the uterus), there may be concerns about the strength of the scar on your uterus. Prostaglandin medications used for cervical ripening should not be used if you have had a previous cesarean delivery or major uterine surgery because they increase the risk of the uterus rupturing along the scar.^[5] In these cases, your provider will carefully evaluate whether induction is appropriate and which methods would be safest.