Short Tail Sperm Morphology (Quantitative) - Sperm Head Length Distribution

What This Test Measures

The test analyzes the length distribution of sperm heads, particularly identifying a subset of sperm with shorter than normal heads. This is often measured as a percentage of total sperm samples. While not all short-tailed sperm indicate fertility problems, it can be part of a broader evaluation for male infertility.

Why It Might Be Ordered

A healthcare provider may recommend this test if you or your partner are experiencing difficulty conceiving. It can be part of a semen analysis to check for abnormalities in sperm morphology, which may affect fertility. This test is not typically standalone but often included in comprehensive fertility evaluations.

Sample Collection and Preparation

A semen sample is collected through masturbation after at least 2–3 days of abstinence. The sample is then analyzed in a laboratory to measure the distribution of sperm head lengths. This process does not require special preparation beyond standard semen collection guidelines.

What to Expect During the Test

You will likely be asked to provide a semen sample in a private setting. The lab technician will collect the sample and send it to a laboratory for analysis. Results are typically reported as a percentage of sperm with short heads relative to the total sperm population.