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Clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle
BACKGROUND: Urine concentration (UC) provides clinically useful information concerning hydration status and renal function of animals. OBJECTIVES: To characterize the clinical performance of urine specific gravity measured by optical refractometry (U(SG‐R)) or Multistix‐SG urine reagent dipstick (U(...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley & Sons, Inc.
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6524117/ https://www.ncbi.nlm.nih.gov/pubmed/31025445 http://dx.doi.org/10.1111/jvim.15502 |
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author | Megahed, Ameer A. Grünberg, Walter Constable, Peter D. |
author_facet | Megahed, Ameer A. Grünberg, Walter Constable, Peter D. |
author_sort | Megahed, Ameer A. |
collection | PubMed |
description | BACKGROUND: Urine concentration (UC) provides clinically useful information concerning hydration status and renal function of animals. OBJECTIVES: To characterize the clinical performance of urine specific gravity measured by optical refractometry (U(SG‐R)) or Multistix‐SG urine reagent dipstick (U(SG‐D)), urine electrical conductivity using an OAKTON Con 6 conductivity handheld meter (U(EC)), urine color (U(Color)) using a custom‐designed 8‐point color chart, and urine creatinine concentration (U(Creat)) for assessing UC in dairy cattle. ANIMALS: 20 periparturient Holstein‐Friesian cows. METHODS: Urine was obtained by perineal stimulation or urethral catheterization and urine osmolality (U(Osm), reference method), U(SG‐R), U(SG‐D), U(EC), U(Color), and U(Creat) determined. Diagnostic test performance was evaluated using Spearman's rho and logistic regression to determine the area under the receiver operating curve (AUC) and optimal cut point for diagnosing hypohydration (U(Osm) ≥800 mOsm/kg). P < .05 was considered significant. RESULTS: The best performing test for diagnosing hypohydration was U(SG‐R) (AUC = 0.90) at an optimal cut point ≥1.030. The second‐best performing test was U(EC) (AUC = 0.82) at a cut point of ≥23.7 mS/cm, followed by U(Creat) (AUC = 0.76) at a cut point of ≥95.3 mg/dL, and U(Color) (AUC = 0.74) at a cut point of ≥4 on an 8‐point scale. Urine specific gravity measured by dipstick performed poorly (AUC = 0.63). CONCLUSIONS AND CLINICAL IMPORTANCE: U(SG‐R) and U(EC) provide practical and sufficiently accurate methods for measuring UC in dairy cattle. Urine color had moderate clinical utility as a no‐cost cow‐side method for assessing UC, whereas dipstick refractometry is not recommended for assessing UC. |
format | Online Article Text |
id | pubmed-6524117 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | John Wiley & Sons, Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-65241172019-05-24 Clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle Megahed, Ameer A. Grünberg, Walter Constable, Peter D. J Vet Intern Med FOOD AND FIBER ANIMAL BACKGROUND: Urine concentration (UC) provides clinically useful information concerning hydration status and renal function of animals. OBJECTIVES: To characterize the clinical performance of urine specific gravity measured by optical refractometry (U(SG‐R)) or Multistix‐SG urine reagent dipstick (U(SG‐D)), urine electrical conductivity using an OAKTON Con 6 conductivity handheld meter (U(EC)), urine color (U(Color)) using a custom‐designed 8‐point color chart, and urine creatinine concentration (U(Creat)) for assessing UC in dairy cattle. ANIMALS: 20 periparturient Holstein‐Friesian cows. METHODS: Urine was obtained by perineal stimulation or urethral catheterization and urine osmolality (U(Osm), reference method), U(SG‐R), U(SG‐D), U(EC), U(Color), and U(Creat) determined. Diagnostic test performance was evaluated using Spearman's rho and logistic regression to determine the area under the receiver operating curve (AUC) and optimal cut point for diagnosing hypohydration (U(Osm) ≥800 mOsm/kg). P < .05 was considered significant. RESULTS: The best performing test for diagnosing hypohydration was U(SG‐R) (AUC = 0.90) at an optimal cut point ≥1.030. The second‐best performing test was U(EC) (AUC = 0.82) at a cut point of ≥23.7 mS/cm, followed by U(Creat) (AUC = 0.76) at a cut point of ≥95.3 mg/dL, and U(Color) (AUC = 0.74) at a cut point of ≥4 on an 8‐point scale. Urine specific gravity measured by dipstick performed poorly (AUC = 0.63). CONCLUSIONS AND CLINICAL IMPORTANCE: U(SG‐R) and U(EC) provide practical and sufficiently accurate methods for measuring UC in dairy cattle. Urine color had moderate clinical utility as a no‐cost cow‐side method for assessing UC, whereas dipstick refractometry is not recommended for assessing UC. John Wiley & Sons, Inc. 2019-04-25 2019 /pmc/articles/PMC6524117/ /pubmed/31025445 http://dx.doi.org/10.1111/jvim.15502 Text en © 2019 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals, Inc. on behalf of the American College of Veterinary Internal Medicine. This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. |
spellingShingle | FOOD AND FIBER ANIMAL Megahed, Ameer A. Grünberg, Walter Constable, Peter D. Clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle |
title | Clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle |
title_full | Clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle |
title_fullStr | Clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle |
title_full_unstemmed | Clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle |
title_short | Clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle |
title_sort | clinical utility of urine specific gravity, electrical conductivity, and color as on‐farm methods for evaluating urine concentration in dairy cattle |
topic | FOOD AND FIBER ANIMAL |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6524117/ https://www.ncbi.nlm.nih.gov/pubmed/31025445 http://dx.doi.org/10.1111/jvim.15502 |
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