Evaluación de la insulinemia post carga oral de glucosa como método diagnóstico de resistencia a la insulina / Evaluation of serum insulin levels after an oral glucose load for the diagnosis of insulin resistance
Arancibia, Constanza; Galgani, José; Valderas, Juan P; Morales, Mauricio; Santos, José Luis; Pollak, Felipe.
Rev. méd. Chile
; 142(9): 1106-1112, set. 2014. ilus, tab
Artículo
en Español
| LILACS | ID: lil-730280
Background:
In our country, the assessment of insulin resistance (IR) measuring serum insulin levels at 60 and 120 minutes after a 75 g oral glucose tolerance test (OGTT), is usual. However, there is no information about the distribution of serum insulin levels in the Chilean population.Aim:
To assess the distribution of serum insulin levels at 60 and 120 minutes during OGTTs and suggest a statistical cut-off point to estimate the degree of IR. Material andMethods:
Retrospective analysis of 1815 OGTTs performed in non-diabetic subjects aged between 18 and 75 years, at a university medical center. HOMA-IR (Homeostasis Model Assessment), insulin sensitivity index of Matsuda (ISI-Composite), and their correlation with serum insulin levels at 60 and 120 minutes were calculated.Results:
The 75th percentiles for serum insulin levels at 60 and 120 minutes were 127 and 81 µU/mL, respectively. There was a high correlation between HOMA-IR and ISI-Composite (r = -089, p < 0.001). There was a weaker although significant correlation between HOMA-IR and ISI-Composite and insulin levels at 60 (r = 0.56 and -0.79 respectively, p < 0,001) and 120 minutes (r = 0.54 and -0.75 respectively, p < 0,001).Conclusions:
We propose 60 and 120 min serum insulin levels of 130 and 80 µU/mL respectively, as cut-off values for normality during OGTT in Chilean normoglycemic individuals.
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