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Horm Res Paediatr. 2014;81(6):386-90. doi: 10.1159/000357268. Epub 2014 May 1.

L-dopa is a potent stimulator of cortisol in short children.

Author information

1
Third Department of Pediatrics, Attikon University Hospital, Athens, Greece.

Abstract

AIMS:

In this study, we evaluated the diagnostic usefulness of oral L-dopa as a stimulatory agent for cortisol.

METHODS:

In 27 short children that were evaluated for possible growth hormone deficiency (GHD), the levels of serum GH and cortisol were determined after oral L-dopa administration and after i.m. glucagon administration. We defined cortisol concentrations >18 μg/dl (496 nmol/l) as adequate response. Peak GH concentration <10 ng/ml in both tests defined GHD.

RESULTS:

Twenty-five out of the 27 children (93%) studied showed a normal cortisol response, i.e. a peak serum cortisol >18 μg/dl in the L-dopa test, whereas 19 children (70%) had a normal cortisol response after stimulation with glucagon. In the children with normal cortisol response in both tests, the mean peak serum cortisol concentration was 28.7 (SD 1.59) after L-dopa and 26.65 (SD 1.26) μg/dl after glucagon administration. There was no statistically significant difference in peak serum cortisol response to L-dopa between GH-deficient and GH-sufficient children [25.90 (SD 4.9) vs. 29.87 (SD 9.9) μg/dl, respectively].

CONCLUSIONS:

These results clearly suggest that L-dopa administration is a potent stimulus for cortisol secretion at least in short children.

PMID:
24802138
DOI:
10.1159/000357268
[Indexed for MEDLINE]

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