Fasting glucose insulin ratio: a useful measure of insulin resistance in girls with premature adrenarche.
The purpose of this study was to determine whether the fasting glucose/insulin ratio is a useful screening test for insulin resistance in prepubertal girls with premature adrenarche. The glucose/insulin ratio was compared with the insulin sensitivity index calculated from the frequently sampled iv glucose tolerance test with tolbutamide using the minimal model computer program. Thirty-three prepubertal girls (22 Caribbean Hispanic and 11 African American; mean age, 6.8 yr; bone age, 8 yr) were studied. All underwent a 60-min ACTH stimulation test. The fasting glucose/insulin ratio was also compared with IGF-binding protein-1 and ACTH-stimulated androgen levels. Insulin sensitivity correlated significantly with the glucose/insulin ratio (0.76; P < 0.001), fasting insulin (0.75; P < 0.001), and IGF-binding protein-1 (0.59; P < 0.005). Stepwise regression analysis with the insulin sensitivity index as the dependent variable showed that the fasting glucose/insulin ratio was significantly predictive of the insulin sensitivity index (P < 0.002). When viewed as a screening test, setting a value of the fasting glucose/insulin ratio of less than 7 as abnormal and of less than 5.7 x 10(-4) min/microU.ml for the insulin sensitivity index as evidence of insulin resistance (normal prepubertal insulin sensitivity index, >5.7 x 10(-4) min/microU.ml), the sensitivity of the fasting glucose/insulin ratio was 87%, and the specificity was 89%. Furthermore, those girls with a low glucose/insulin ratio (<7) had higher body mass index, fasting insulin, free T, and ACTH-stimulated 17-hydroxypregnenolone and lower fasting IGF-binding protein-1 and SHBG than those girls with a glucose/insulin ratio greater than 7. The fasting glucose/insulin ratio is a useful screening test for insulin resistance in prepubertal Caribbean Hispanic and African American girls with premature adrenarche.
Vuguin
P
P
Department of Pediatrics, Division of Pediatric Endocrinology, Albert Einstein College of Medicine/Children's Hospital, Montefiore Medical Center, 111 East 210th Street, Bronx, NY 10467, USA.
Saenger
P
P
Dimartino-Nardi
J
J
D000303:Adrenal Cortex Diseases / Q000097:blood*; D000728:Androgens / Q000378:metabolism*; D001786:Blood Glucose / Q000032:analysis*; D002648:Child; D002675:Child, Preschool; D005215:Fasting; D005260:Female; D006801:Humans; D007328:Insulin / Q000097:blood*; D007333:Insulin Resistance; D011627:Puberty
D000728:Androgens; D001786:Blood Glucose; D007328:Insulin