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Influence of three different preparation techniques on the results of human sperm morphology analysis
1Institute of Reproductive Medicine, University (WHO Collaborating Centre for Research in Human Reproduction), Münster, Germany.
Abstract:
Using 158 unselected semen samples the present study has analysed how the results of sperm morphology assessment were influenced by different techniques for preparing the slides for microscopic assessment. All three techniques compared, the Papanicolaou stain (PAP), the Shorr stain (SHO) and the 'wet preparations' protocol (WET) are currently recommended by the World Health Organization for use in andrology laboratories. Mean percentages of morphologically normal spermatozoa were identical on PAP and SHO slides (31.1%), but were significantly lower in wet preparations (12.3%). Wide divergence of results obtained with the three different methods was also found with respect to the percentage of sperm with head, midpiece and tail defects and two 'indices of teratozoospermia'. For the majority of parameters assessed, linear regression analysis revealed a poor correlation between evaluations of PAP, SHO and WET slides (r values ranging from 0.01 to 0.87). We conclude that only one standard method should be recommended for the preparation of morphology slides in order to ensure inter-laboratory comparability of results and to enhance the value of sperm morphology analysis for predicting fertility.
Insights
Sperm morphology assessment results vary significantly based on slide preparation methods. Standardizing techniques like Papanicolaou stain is crucial for accurate fertility predictions and inter-laboratory consistency.
Area of Science:
- Andrology
- Reproductive Biology
- Medical Laboratory Science
Background:
- Sperm morphology assessment is vital for male fertility evaluation.
- Current World Health Organization guidelines recommend multiple slide preparation techniques.
Purpose of the Study:
- To analyze the influence of different slide preparation techniques on sperm morphology assessment results.
- To compare the Papanicolaou stain (PAP), Shorr stain (SHO), and wet preparations (WET) protocols.
Main Methods:
- Analysis of 158 unselected semen samples.
- Microscopic assessment of sperm morphology using PAP, SHO, and WET slide preparation methods.
- Linear regression analysis to determine correlations between methods.
Main Results:
- Mean percentage of morphologically normal spermatozoa was 31.1% for PAP and SHO, but only 12.3% for WET preparations.
- Significant divergence in results for head, midpiece, and tail defects, and teratozoospermia indices.
- Poor correlation (r values 0.01-0.87) between PAP, SHO, and WET slide evaluations.
Conclusions:
- Different slide preparation techniques yield significantly different sperm morphology results.
- A single, standardized method for slide preparation is recommended for improved inter-laboratory comparability.
- Standardization will enhance the predictive value of sperm morphology analysis for male fertility.