Comparison of three methods of sampling for endometrial cytology in the mare. Preliminary study.

The study compares three methods of collecting endometrial cytological specimens in Standardbred mares, seeking the most effective approach for diagnosing acute endometrial inflammation. It identifies the uterine cytobrush as yielding superior sample quality, while noting that the quantity of neutrophils retrieved was consistent across all techniques evaluated.

Study Purpose and Methods

• The research aimed to compare three different methods of gathering endometrial cytological samples in mares, striving to diagnose acute endometrial inflammation accurately. The techniques analyzed were the guarded culture swab, the uterine cytobrush, and the low volume uterine flush.
• The study involved six healthy Standardbred mares in dioestrus. Researchers induced acute endometritis in each mare using a sterile isotonic solution and collected samples two days later.
• The quality of the specimens was evaluated based on the sample’s quality and cellularity and the number of neutrophils recovered.

Results

• The results showed a significant advantage for the uterine cytobrush, which yielded significantly better quality slides than the low volume flush. The quality difference between the cytobrush and the double guarded swab technique was not statistically significant.
• Despite the quality variance, the study found no significant difference in the number of neutrophils retrieved by each of the three methods. Further, there was no difference in the cell count of endometrial cells retrieved among the techniques.

Conclusion and Implications

• As endometrial cytology is useful for diagnosing acute endometrial inflammation in mares, the sampling method chosen should rely heavily on considerations such as feasibility, cost, and potential drawbacks of each approach.
• Despite the superior sample quality yielded by the uterine cytobrush, the lack of significant difference in neutrophils’ count across all three techniques suggested that any of the methods could be employed, especially in settings where cost and ease of use are the primary considerations.