Urine Reagent Strips Are Inaccurate for Assessing Hypohydration: A Brief Report

J. D. Adams, Catalina Capitan-Jiménez, Robert A. Huggins, Douglas J. Casa, Andy Mauromoustakos, Stavros A. Kavouras

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


OBJECTIVE: To assess the diagnostic ability of urine reagent strips to identify hypohydration based on urine specific gravity (USG). DESIGN: This study examined the agreement of USG between strips and refractometry with Bland-Altman, whereas the diagnostic ability of the strips to assess hypohydration was performed by receiver operating characteristic analysis. SETTING: Arkansas high school football preseason practice. PARTICIPANTS: Four hundred fourteen fresh urine samples were analyzed. MAIN OUTCOME MEASURES: Urine specific gravity was assessed by both reagent strips and refractometry. Cutoffs of >1.020 and >1.025 were used for identifying hypohydration. RESULTS: Bland-Altman analysis showed agreement of the 2 methods. Overall diagnostic ability of the urine strip to identify hypohydration was fair (area under the curve 72%-78%). However, the sensitivity to correctly identify hypohydration was poor (63%-71%), and the specificity of correctly identifying euhydration was poor to fair (68%-83%). CONCLUSION: The urine strip method is not valid for assessing hypohydration.

Original languageEnglish (US)
Pages (from-to)506-508
Number of pages3
JournalClinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine
Issue number6
StatePublished - Nov 1 2019
Externally publishedYes

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation


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