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Can abnormal sperm morphology fertilize an egg?

By Marta Barranquero Gómez B.Sc., M.Sc. (embryologist).
Last Update: 09/03/2025

Yes, it's possible, but it will be more complicated and, even if they fertilize the egg, it can end in a miscarriage. The reasons why fertilization by morphologically abnormal sperm is more complicated are the following:

Severe defects in the head and neck that prevent the sperm from assuming the correct position to penetrate the egg will lead to fertilization failure.

Anomalies of the neck and tail make it difficult for the sperm to advance, so they are not able to reach the egg to fertilize it.

Sperm with multiple structural deformities may also have chromosomal abnormalities.

Read the full article on: What Types of Sperm Morphological Defects Exist? ( 72).
 Marta Barranquero Gómez
Marta Barranquero Gómez
B.Sc., M.Sc.
Embryologist
Graduated in Biochemistry and Biomedical Sciences by the University of Valencia (UV) and specialized in Assisted Reproduction by the University of Alcalá de Henares (UAH) in collaboration with Ginefiv and in Clinical Genetics by the University of Alcalá de Henares (UAH).
License: 3316-CV
Embryologist. Graduated in Biochemistry and Biomedical Sciences by the University of Valencia (UV) and specialized in Assisted Reproduction by the University of Alcalá de Henares (UAH) in collaboration with Ginefiv and in Clinical Genetics by the University of Alcalá de Henares (UAH). License: 3316-CV.