Nursing care
Preterm Labor nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 7 min read · Updated September 2026
Short answer
Preterm labor nursing care means confirming contractions with cervical change before 37 weeks, then acting fast to get antenatal corticosteroids on board. Tocolytics buy time for the steroids, and it is the steroids that save the lungs. Alongside that, the nurse monitors the fetus, screens for infection and rupture of membranes, gives magnesium for neuroprotection where indicated, and watches for drug toxicity.
The clinical picture
Preterm labor is regular uterine contractions with cervical change between 20 weeks and 36 weeks 6 days. Contractions alone are not enough. Many women have irritability that settles with hydration and rest, and the diagnosis rests on the cervix dilating or effacing. Threatened preterm labor is the term used when contractions are present but the cervix has not yet changed.
The presentation is often vague. Women describe menstrual-like cramping, a dull low backache, pelvic pressure, or a change in vaginal discharge that becomes watery, mucousy or blood-tinged. Some report more than four to six contractions an hour that do not ease with a change of position. Risk factors worth asking about include a previous preterm birth, multiple gestation, a short cervix, urinary or genital tract infection, smoking, and a short interval since the last pregnancy.
Why the urgency matters is simple. Before 34 weeks the fetal lungs lack surfactant, and the earlier the birth, the higher the risk of respiratory distress syndrome, intraventricular haemorrhage and necrotising enterocolitis. Every hour gained before 34 weeks has a purpose.
Assessment: what to look for and in what order
Start with the fetus and the uterus together. Apply the external monitor and note contraction frequency, duration and resting tone, then read the fetal heart rate baseline, variability and any decelerations. Confirm gestational age from the record, because the whole management plan hinges on whether she is under 34 weeks.
Next establish whether the membranes have ruptured. Ask about leaking fluid, look at the pad, and use a sterile speculum examination with nitrazine or fern testing if the history is unclear. Do not perform a digital cervical examination until placenta previa has been excluded and until you know whether the membranes are intact. If a digital examination is appropriate, document dilation, effacement and station as the baseline against which change is measured.
Then screen for a cause. Take temperature and maternal pulse for chorioamnionitis, send a urinalysis and culture for infection, and collect a group B streptococcus swab if the status is unknown. Where the picture is unclear, a fetal fibronectin swab and a transvaginal cervical length help predict who will actually deliver. A negative fibronectin is reassuring for the next seven days.
Immediate interventions
The first drug that matters is the corticosteroid. Betamethasone 12 mg intramuscularly, two doses 24 hours apart, or dexamethasone 6 mg intramuscularly, four doses 12 hours apart, given between 24 and 34 weeks. The full benefit for lung maturity comes when the course has had 48 hours to work. Tocolytics buy time for the steroids, and it is the steroids that save the lungs.
Tocolysis is therefore short term, usually 48 hours, and is not used to prolong pregnancy indefinitely. Nifedipine is a common first choice and drops blood pressure, so check it before each dose. Indomethacin is used before 32 weeks only, because it can constrict the fetal ductus arteriosus and reduce amniotic fluid. Terbutaline 0.25 mg subcutaneously is a short-acting option; hold it if the maternal pulse is above 120 and do not use it beyond 48 to 72 hours.
Before 32 weeks, magnesium sulfate is given for fetal neuroprotection to reduce cerebral palsy. Start intravenous penicillin G for group B streptococcus prophylaxis if the status is positive or unknown and delivery looks likely. Tocolysis is withheld when the mother or fetus would be safer delivered: chorioamnionitis, severe pre-eclampsia, abruption or a non-reassuring fetal heart rate.
Ongoing nursing management
On magnesium, the nurse is the safety net. Check deep tendon reflexes, respiratory rate and urine output every hour. Loss of patellar reflexes is the first sign of toxicity, followed by a respiratory rate under 12 and urine output under 30 mL an hour. Keep calcium gluconate at the bedside as the antidote, and expect the woman to feel flushed, hot and nauseated as a normal effect of the infusion.
Continue continuous fetal monitoring and tocometry while contractions persist, and reassess the cervix only when there is a clinical reason, not on a schedule, because each examination raises infection risk. Track maternal temperature, pulse and blood pressure, particularly on nifedipine or terbutaline. Report a rising temperature, foul-smelling fluid or fetal tachycardia straight away as possible chorioamnionitis.
Position her on her side to improve uterine perfusion, keep her hydrated without overloading her, and encourage regular bladder emptying because a full bladder irritates the uterus. If she is under 34 weeks and stable, confirm the neonatal team knows about her and that the receiving unit has a cot. Transfer to a hospital with the right level of neonatal care happens before delivery, not after.
Patient and family education
Teach her the signs that mean coming straight back: contractions more often than every ten minutes for an hour, a gush or trickle of fluid, vaginal bleeding, a change in discharge, pelvic pressure, or reduced fetal movement. Be specific that backache and cramping count, because many women dismiss them as normal pregnancy discomfort.
Explain what each drug is for in plain terms. The steroid injections help the baby's lungs and take about two days to work fully. The tocolytic is there to hold off labour long enough for that to happen, not to stop labour for weeks. Magnesium protects the baby's brain and will make her feel warm and sluggish. Understanding this stops her feeling that treatment has failed if she goes on to deliver.
At discharge, cover activity as her clinician has prescribed, since strict bed rest is no longer routinely recommended and carries its own risks. Advise on hydration, avoiding nipple stimulation, treating any urinary infection fully, and stopping smoking. Give the family a clear plan for who to call and where to go, day or night.
How this appears on the NCLEX
The exam tests priority and drug safety more than pathophysiology. A common stem gives you a woman at 30 weeks with regular contractions and asks which order to carry out first. The answer is almost always the corticosteroid or fetal monitoring, not the comfort measure. If the stem describes a tocolytic and a steroid, remember the logic: the tocolytic is there to cover the 48 hours the steroid needs.
Magnesium sulfate questions ask which finding to report, and the answer is absent deep tendon reflexes, respirations under 12, or urine output under 30 mL an hour, with calcium gluconate as the antidote. Terbutaline questions hinge on maternal tachycardia. Indomethacin questions test the 32-week cut-off and the ductus arteriosus. Nifedipine questions test blood pressure.
Expect a contraindication question too. If the stem describes fever, foul-smelling fluid, heavy bleeding or late decelerations, the correct action is to prepare for delivery, not to start or continue tocolysis. And on any preterm stem, a digital cervical examination is wrong if bleeding or placenta previa has not been ruled out.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our maternity and newborn practice questions are the closest set to what this page covers.
Common questions
What is the priority nursing intervention for preterm labor?
Confirm fetal wellbeing and gestational age, then get antenatal corticosteroids given if she is between 24 and 34 weeks. The steroids are what reduce neonatal respiratory distress. Tocolytics matter only because they hold labour off long enough for the steroids to work.
How long are tocolytics given for preterm labor?
Usually 48 hours, which is the time a course of betamethasone or dexamethasone needs to reach full effect. They are not continued to prolong the pregnancy beyond that, and terbutaline in particular should not run past 48 to 72 hours because of maternal cardiac risk.
What are the signs of magnesium sulfate toxicity in preterm labor?
Loss of deep tendon reflexes comes first, then a respiratory rate under 12 breaths a minute, urine output under 30 mL an hour, and eventually respiratory or cardiac arrest. Stop the infusion and give calcium gluconate. Flushing, warmth and nausea are expected effects, not toxicity.
When should tocolysis not be given?
When continuing the pregnancy is more dangerous than delivering. That includes chorioamnionitis, placental abruption, severe pre-eclampsia, fetal death, a lethal fetal anomaly, or a non-reassuring fetal heart rate. In those cases the nurse prepares for birth rather than trying to stop it.
Why is indomethacin only used before 32 weeks?
After 32 weeks it can cause premature closure of the fetal ductus arteriosus and reduce amniotic fluid volume. Courses are kept short, generally no more than 48 hours, and the fetus may be checked by ultrasound if it is used for longer.