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Eur J Endocrinol. 2012 Feb;166(2):295-9. doi: 10.1530/EJE-11-0720. Epub 2011 Nov 14.

The utility of basal serum LH in prediction of central precocious puberty in girls.

Author information

1
Pediatric Endocrinology and Metabolism Unit, Faculty of Health Sciences, Soroka Medical Center, Ben-Gurion University of the Negev, PO Box 151, IL-84101 Beer-Sheva, Israel.

Abstract

OBJECTIVE:

The mainstay of distinction between prepubertal girls and girls who are suspected of having central precocious puberty (CPP) is based on gonadotropin measurements after a GnRH stimulation test to evaluate hypothalamic-pituitary-gonadal axis maturity. The objective of this study was to determine whether a single basal gonadotropin measurement carries a useful predictive value in verifying or refuting the diagnosis of CPP.

DESIGN AND METHODS:

Basal serum LH and FSH were measured by a chemiluminescent immunometric assay in a cohort of girls who had been evaluated for CPP before and after GnRH stimulation test. Peak LH levels higher than 5 IU/l were considered a pubertal response.

RESULTS:

Eighty girls with suspected breast development before 8 years of age were enrolled to the study, out of whom 42 had CPP. Low basal serum LH (≤0.1 IU/l) was sufficient to rule out the diagnosis of CPP in 94.7% of the 38 prepubertal girls; the sensitivity of basal LH levels for this purpose was only 64%. The basal FSH and the basal LH to FSH ratio achieved less efficient predictive value with 76 and 71% sensitivity and 73 and 86% specificity respectively.

CONCLUSION:

A single basal LH measurement may be adequate to confirm but not to refute the presence of CPP in most of the girls who are evaluated for early pubertal signs.

PMID:
22084156
DOI:
10.1530/EJE-11-0720
[Indexed for MEDLINE]

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