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Validation of daily urinary creatinine excretion measurement by muscle-creatinine equivalence.
Iacone, Roberto; D'Elia, Lanfranco; Guida, Bruna; Barbato, Antonio; Scanzano, Clelia; Strazzullo, Pasquale.
Afiliação
  • Iacone R; Department of Clinical Medicine and Surgery, Federico II University Medical School, Naples, Italy.
  • D'Elia L; Department of Clinical Medicine and Surgery, Federico II University Medical School, Naples, Italy.
  • Guida B; Department of Clinical Medicine and Surgery, Federico II University Medical School, Naples, Italy.
  • Barbato A; Department of Clinical Medicine and Surgery, Federico II University Medical School, Naples, Italy.
  • Scanzano C; Department of Clinical Medicine and Surgery, Federico II University Medical School, Naples, Italy.
  • Strazzullo P; Department of Clinical Medicine and Surgery, Federico II University Medical School, Naples, Italy.
J Clin Lab Anal ; 32(6): e22407, 2018 Jul.
Article em En | MEDLINE | ID: mdl-29424044
ABSTRACT

BACKGROUND:

Twenty-four-hour urinary creatinine excretion (24hUCrE) is strongly correlated with skeletal muscle mass (SMM). This study suggests how to exploit the power of the SMM-24hUCrE correlation to assess the accuracy of 24hUCrE measurement.

METHODS:

Four hundred and sixty-six men, a subgroup of participants in the 2002-2004 follow-up examination of the Olivetti Heart Study, performed a 24-h urine collection to measure 24hUCrE and underwent bioelectrical impedance analysis to evaluate SMM. Linear regression analysis between 24hUCrE and SMM was used to calculate the muscle-creatinine equivalence and to develop an equation to predict the 24hUCrE depending on SMM. The accuracy of the 24hUCrE measurement was assessed using the change in the SMM-24hUCrE correlation coefficient upon variation in the percentage deviation (%D) between the measured and predicted 24hUCrE.

RESULTS:

The calculated muscle-creatinine equivalence was 1 g of 24hUCrE = 22.73 kg of SMM. The %Ds and the corresponding SMM-24hUCrE correlation coefficients were as follows %D = 3.0, r = .997; %D = 4.7, r = .989; %D = 8.1, r = .963; %D = 10.5, r = .940; %D = 12.6, r = .909; %D = 18.9, r = .825; %D = 25.8, r = .707; %D = 33.5, r = .595; %D = 41.4, r = .453.

CONCLUSION:

The increase in %D corresponds to a reduced correlation between muscle mass and creatinine excretion, which indicated a poor performance in the measurement of the 24hUCrE. For studies on single individuals, where small variations in 24hUCrE could be significant, a %D up to 12.6% is suggested; on the other hand, a wider %D interval could be acceptable for population studies.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: J Clin Lab Anal Assunto da revista: TECNICAS E PROCEDIMENTOS DE LABORATORIO Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Itália

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: J Clin Lab Anal Assunto da revista: TECNICAS E PROCEDIMENTOS DE LABORATORIO Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Itália