The most accurate Spanish translation for “when to go to hospital in labor” is **”cuándo ir al hospital en trabajo de parto”**[1].

– **Trabajo de parto** is the standard medical term for “labor” in Spanish, especially in clinical contexts[1].
– **Cuándo ir al hospital** directly translates to “when to go to the hospital.”

Alternative phrasing, such as **”cuándo acudir al hospital durante el trabajo de parto”**, is also correct and commonly used in medical and patient education materials. Both forms are clear and appropriate for professional or informational use.