Tareq Abadl: Sperm Morphology – A Practical Laboratory Guide
Tareq Abadl, Lab Specialist and Blood Bank, MSMC at MSMC Madinah, shared on LinkedIn:
”Sperm Morphology, A Practical Laboratory Guide
Accurate sperm morphology assessment is essential in semen analysis. It requires standardized staining, strict morphological criteria, and experienced microscopic evaluation.
Key Morphological Defects
- Head: Macrocephalic, microcephalic, pyriform, and amorphous heads; abnormal acrosomal features and vacuoles.
- Neck and Midpiece: Bent neck, abnormal insertion, and irregular midpiece.
- Tail: Short, bent, coiled, or multiple tails.
- Cytoplasm: Excess residual cytoplasm.
Laboratory Pearl
According to the WHO Laboratory Manual for the Examination and Processing of Human Semen, 6th edition (2021), the lower fifth-percentile reference value for normal sperm morphology is approximately 4%, using strict criteria.
This is a reference value, not a definitive fertility or infertility cutoff. Morphology should be interpreted alongside sperm concentration, motility, total sperm number, and clinical findings.
Best Practice
- Use validated staining methods and standardized assessment criteria.
- Examine slides at approximately ×1000 magnification with oil immersion.
- Maintain quality assurance and observer competency.
Reference: WHO Laboratory Manual for the Examination and Processing of Human Semen, 6th edition, 2021.
Standardized assessment. Reliable results. Better laboratory practice.
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