Sperm Morphology Analysis (Quantitative Head Defects)

Why This Test Is Done

A sperm morphology test is often part of an evaluation for male infertility, especially when other sperm function tests (like motility or count) are normal. It helps doctors check if sperm head defects—such as irregular shapes—are contributing to difficulties conceiving. This test may also be used in cases of unexplained infertility or before fertility treatments like IVF.

What to Expect Before the Test

You’ll need to provide a semen sample, typically collected through masturbation into a sterile container. The sample is usually collected in a clinic or doctor’s office. Avoid ejaculation for 2–3 days before testing to ensure a representative sample. Alcohol, caffeine, or strenuous activity before the test may also affect results.

What Happens During the Test

Your semen sample is analyzed under a microscope to count and examine the shape of sperm heads. Special stains may be used to highlight abnormalities. The test focuses on defects like irregular heads, missing tails, or other structural issues that could impair sperm function.

What the Results Mean

Results are reported as a percentage of sperm with normal head shapes (typically 14% or higher is considered normal, though this can vary by lab). Abnormalities may include heads that are misshapen, double-headed, or otherwise non-functional. High percentages of defective sperm may suggest underlying issues like genetic disorders, infections, or exposure to toxins.