Mitochondrial membrane potential integrity and plasma membrane translocation of phosphatidylserine as early apoptotic markers: a comparison of two different sperm subpopulations.

Objective: To examine whether a relationship exists between loss of mitochondrial transmembrane potential and plasma membrane translocation of phosphatidylserine (PS) in subpopulations of human spermatozoa of men consulting for infertility.

Setting: A tertiary institutional research center.

Design: Prospective observational study.