- Mild teratozoospermia
- Between 10% and 14% of the sperm have a normal morphology.
- Moderate teratozoospermia
- Only 5-10% of the sperm have an abnormal shape.
- Severe teratozoospermia
- Less than 5% of the sperm have a normal morphology.
It should be noted that this definition has been created using Kruger's strict criteria, according to which a man has teratozoospermia if over 85% of the sperms present in his ejaculate have an abnormal morphology.
By Elena Lobo González MA (embryologist), Jon Ander Agirregoikoa M.D. (gynecologist), Marta Barranquero Gómez B.Sc., M.Sc. (embryologist) and Michelle Lorraine Embleton B.Sc. Ph.D. (biochemist).
Last Update: 09/30/2022