Two hours ago a multigravid in labor without anesthesia showed 5 cm dilation, complete effacement, presenting part at 0 station, membranes intact; now the client is irritable with nausea and one episode of vomiting. Which phase of labor is most likely occurring?

• A. Latent phase of labor.
• B. Active phase of labor.
• C. Transition phase of labor.
• D. Pushing stage.

Answer: (C)

The scenario is testing recognition of the transition phase of labor. In transition, contractions are at their peak, childbirth-related stress is greatest, and autonomic symptoms like irritability, nausea, and vomiting are common as the body prepares for imminent delivery. The fact that she was 5 cm two hours ago places her in the active phase, but the new symptoms point to the final, most intense phase just before complete dilation and pushing. Transition typically occurs around 8–10 cm of dilation and is characterized by strong, frequent contractions with marked fatigue, irritability, and nausea/vomiting. Pushing would come after full dilation, and latent phase would involve early dilation with milder symptoms.