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Updated: Jul 19, 2026

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Sperm Collection of Differential Quality Using Density Gradient Centrifugation
Published on: November 29, 2018
Lessons learned from a sperm morphology quality control programme
1Department of Obstetrics & Gynaecology, Reproductive Biology Research Laboratory, University of Stellenbosch, Tygerberg, South Africa. drf@sun.ac.za
Andrologia
|November 4, 2006
Summary
Continuous quality control and refresher training significantly improve sperm morphology assessment accuracy. This enhances the reliability of semen analyses for fertility evaluations.
Area of Science:
- Andrology
- Reproductive Medicine
- Quality Control in Diagnostics
Background:
- Sperm morphology assessment is crucial for predicting fertilization success but suffers from inter-observer variability.
- Subjective evaluation by laboratory technicians impacts the reliability of semen analysis reports.
Purpose of the Study:
- To evaluate the impact of continuous external quality control and refresher training on sperm morphology reading skills.
- To determine the effectiveness of monitoring and retraining over 40 months.
Main Methods:
- Nineteen technicians from 12 laboratories participated in a quality control program with initial training.
- Quarterly monitoring and annual refresher courses were implemented for a subset of participants.
- Technician performance was assessed against a reference laboratory using +/- 0.5 SD and +/- 0.2 SD error limits.
Main Results:
- 78% of technicians maintained readings within +/- 0.5 SD limits after initial training and ongoing monitoring.
- Technicians attending annual refresher courses consistently achieved results within +/- 0.2 SD limits.
- Initial training combined with continuous quality control and refresher courses demonstrated sustained high-level performance.
Conclusions:
- Initial training and ongoing external quality control are essential for accurate sperm morphology assessment.
- Annual refresher courses further enhance and maintain high proficiency in morphology readings.
- Standardized training and quality assurance programs are vital for reliable andrology laboratory results.
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