The first stage of labor can last anywhere from which range?

• A. 1-2 hours
• B. 6-12 hours
• C. 12-24 hours
• D. 2-24 hours

Answer: (D)

The duration of the first stage is highly variable because it includes both the latent phase and the active phase of labor. The latent phase starts with irregular to regular contractions and gradual thinning and early dilation of the cervix; this part can last many hours and, in some first pregnancies, even longer than a day. The active phase follows, with more rapid dilation from about 4 cm to 10 cm, but even this portion can vary a lot in length from one labor to another and between people.

Because of this wide variability, the overall range for the first stage can be quite broad. The best choice reflects that variability by spanning from a couple of hours to about a day or more. Shorter ranges miss the longer latent or slow-progressing labors, while a narrower range would not fit many real-world cases.