Assessment of a portable prothrombin time analyzer (CoaguChek-XS) in dogs

Authors

  • Efrat Kelmer DVM, MS, DACVECC,

    Corresponding author
    1. Department of Small Animal Emergency and Critical Care, the Hebrew University Veterinary Teaching Hospital, Koret School of Veterinary Medicine, Rehovot, Israel
    • Address correspondence and reprint requests to Dr. Kelmer, Hebrew University Veterinary Teaching Hospital, Koret School of Veterinary Medicine, PO Box 12, Rehovot 76100, Israel. Email: kelmere1@gmail.com

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  • Gilad Segev DVM, DECVIM,

    1. Department of Small Animal Emergency and Critical Care, the Hebrew University Veterinary Teaching Hospital, Koret School of Veterinary Medicine, Rehovot, Israel
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  • Carolina Codner DVM,

    1. Department of Small Animal Emergency and Critical Care, the Hebrew University Veterinary Teaching Hospital, Koret School of Veterinary Medicine, Rehovot, Israel
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  • Yaron Bruchim DVM, DACVECC,

    1. Department of Small Animal Emergency and Critical Care, the Hebrew University Veterinary Teaching Hospital, Koret School of Veterinary Medicine, Rehovot, Israel
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  • Sigal Klainbart DVM, DACVECC,

    1. Department of Small Animal Emergency and Critical Care, the Hebrew University Veterinary Teaching Hospital, Koret School of Veterinary Medicine, Rehovot, Israel
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  • Itamar Aroch DVM, DECVIM

    1. Department of Small Animal Emergency and Critical Care, the Hebrew University Veterinary Teaching Hospital, Koret School of Veterinary Medicine, Rehovot, Israel
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  • The CoaguChek-XS test strips, and some of the reagents used for ACA-PT, were provided by DYN Diagnostics LTD, Caesarea, Israel. The authors declare no other conflict of interests.

Abstract

Objectives

To assess the performance of a portable prothrombin time (PT) analyzer (CoaguChek-XS) in dogs.

Animals

Ninety-seven dogs composed of 20 healthy dogs, 45 ill dogs, and 32 ill dogs with altered coagulation.

Procedures

Samples were concurrently obtained and PT was measured using the CoaguChek-XS and an automated coagulation analyzer. Agreement between methods was assessed using Spearman's correlation and Bland–Altman analysis.

Results

The reference interval for PT using the CoaguChek-XS was 9.6–11.5 s. The CoaguChek-XS was easy to use, required a small volume of whole blood, and gave results within 1 min. The mean difference in PT between the 2 methods was 2.58 s (SD 3.10), and 94% of the samples fell within limits of agreement. The correlation was moderate, but significant (r = 0.35, P < 0.001). Sensitivity and specificity of the CoaguCheck-XS PT compared to analyzer PT were 92% and 56%, respectively, and increased to 95% and 77% on intent to treat basis. The coefficient of variance was 0.72%.

The CoaguChek-XS identified all 8 dogs with anticoagulant rodenticide intoxication, although a discrepancy was noted from the analyzer results. In anemic dogs (PCV≤25%), the CoaguChek-XS did not display accurate results.

Conclusions

The CoaguChek-XS is a simple, user-friendly, highly precise PT analyzer. Results had moderate correlation and good agreement with a standard method. It can be used reliably for screening dogs when the PT is normal. However, when the CoaguChek-XS PT is prolonged or when the PCV is ≤25%, results should be confirmed using a standard method.

Ancillary