Most hospitals admit you when your cervix is dilated to at least 4 centimeters, though current obstetric guidelines suggest active labor may not truly begin until 5 to 6 centimeters for many women. The short answer: head to the hospital when your contractions are strong, regular, and progressing, but the number on the cervical check isn’t the only thing that matters.
The 4 to 6 Centimeter Threshold
For years, 4 centimeters was treated as the bright line between “go home” and “get admitted.” Many hospitals still use it. UC San Diego Health, for example, states that if you’re less than 4 cm dilated you may be sent home, and if you’re more than 4 cm you’ll be admitted.
But the American College of Obstetricians and Gynecologists (ACOG) updated its guidance to reflect newer data: the onset of active labor for many women may not occur until 5 to 6 cm. This means that even at 4 or 5 centimeters, your body could still be in the slow, early phase. ACOG recommends that providers consider expectant management (essentially, watchful waiting without intervening) for women at 4 to 6 cm as long as both mother and baby look healthy. That guidance was reaffirmed in 2025.
In practice, your experience will depend on your hospital’s policies, your provider’s judgment, and what else is happening with your labor. Dilation is one data point. Your care team also evaluates how thin your cervix has become (effacement), the baby’s position, how soft your cervix is, and whether your cervix has moved forward. These five factors together give a more complete picture of how ready your body is for delivery.
Why Arriving Too Early Can Backfire
It’s tempting to head in at the first sign of labor, but research consistently shows that being admitted during the latent (early) phase leads to more medical interventions. Women admitted before active labor are more likely to receive synthetic hormone drips to speed up contractions, have their water broken artificially, need an epidural, or end up with an assisted delivery or cesarean section. These interventions aren’t always harmful, but when they happen because of impatience with a normal early labor rather than a genuine medical need, they add risk without clear benefit.
Studies also find that programs encouraging women to stay home until active labor is established result in shorter time spent on the labor ward and higher levels of control during birth. International guidelines broadly recommend delaying hospital admission until active labor is confirmed, as long as there are no warning signs.
The 5-1-1 Rule for Timing Contractions
Since you can’t check your own cervix, contraction patterns are the practical tool for deciding when to leave. The 5-1-1 rule is the most widely taught guideline: contractions coming every 5 minutes, each lasting 1 minute, for at least 1 hour. When your contractions hit that pattern and you can’t talk or walk comfortably through them, it’s time to go.
Some providers use a 4-1-1 or even 3-1-1 rule depending on your distance from the hospital or your birth history. If you’ve had a previous fast labor (under three hours from start to finish), your provider will likely tell you to come in earlier than this standard guideline suggests. The further you live from the hospital, the more conservative your departure timing should be.
When to Go Regardless of Dilation
Certain situations call for heading to the hospital immediately, no matter where you are in the dilation process:
- Your water breaks. If you feel a gush or a steady trickle of fluid, head to your delivery facility. Even if you’re unsure whether it’s amniotic fluid, go in to be checked. Once the membranes rupture, the risk of infection increases with time.
- Your baby’s movements change. If your baby stops moving or moves noticeably less than usual, that warrants immediate evaluation. There’s no magic number of kicks that counts as “normal,” but a change from your baby’s typical pattern is what matters.
- Vaginal bleeding. Light spotting can be normal (especially after a cervical check or as your mucus plug releases), but bleeding that looks like a period or heavier is a reason to go right away.
- You’re GBS-positive. If you tested positive for Group B Strep during pregnancy, head to the hospital when labor begins rather than laboring at home. You need IV antibiotics for at least 4 hours before delivery to protect your baby, so the earlier you arrive, the better the chance of completing that course.
What Happens if You’re Sent Home
Getting checked at the hospital and told you’re only 2 or 3 centimeters is one of the most frustrating experiences in pregnancy, especially when contractions feel intense. But being sent home is not a sign that something is wrong. Early labor can last hours or even a day or more, particularly with a first baby.
If you’re sent home, your provider will typically give you a set of benchmarks for when to return: a specific contraction pattern, water breaking, or any warning signs. Use the time to rest, eat light meals, stay hydrated, and save your energy. Walking and changing positions can help labor progress. A warm bath or shower often eases discomfort during this phase.
First Babies vs. Subsequent Births
Your birth history changes the calculus significantly. First-time labor tends to be longer and more gradual, with the early phase sometimes stretching 12 hours or more. For most first-time mothers, waiting until contractions are well established and following the 5-1-1 rule gives plenty of time to get to the hospital.
Second and subsequent labors are often faster, sometimes dramatically so. If your first labor was quick, or if you’ve had multiple vaginal deliveries, your provider may advise leaving for the hospital sooner than the standard guidelines suggest. Some women with a history of rapid labor are told to come in as soon as contractions become regular, regardless of spacing. Talk to your provider about a personalized plan in the weeks before your due date, especially if your previous deliveries moved fast.