Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Anteroposterior (AP)
Medically reviewed by Min Clinic Staff | Updated: January 2026
Anteroposterior (AP): In anatomy, AP stands for anteroposterior: from front-to-back. For example, an AP X-ray of the chest is taken from front-to-back.
AP in this respect is the opposite of PA, which stands for posteroanterior: from back-to-front.