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Test ID: DHEA_    
Dehydroepiandrosterone (DHEA), Serum

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Useful For Suggests clinical disorders or settings where the test may be helpful

Diagnosing and differential diagnosis of hyperandrogenism (in conjunction with measurements of other sex steroids)

 

An initial screen in adults might include dehydroepiandrosterone/dehydroepiandrosterone sulfate and bioavailable testosterone measurement. Depending on results, this may be supplemented with measurements of sex hormone-binding globulin and occasionally other androgenic steroids (eg, 17-hydroxyprogesterone).

 

An adjunct in the diagnosis of congenital adrenal hyperplasia; dehydroepiandrosterone/dehydroepiandrosterone sulfate measurements play a secondary role to the measurements of cortisol/cortisone, 17 alpha-hydroxyprogesterone, and androstenedione.

 

Diagnosing and differential diagnosis of premature adrenarche

Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

Dehydroepiandrosterone (DHEA) is the principal human C-19 steroid. DHEA has very low androgenic potency, but serves as the major direct or indirect precursor for most sex steroids. DHEA is secreted by the adrenal gland and production is at least partly controlled by adrenocorticotropic hormone (ACTH). The bulk of DHEA is secreted as a 3-sulfoconjugate dehydroepiandrosterone sulfate (DHEAS). Both hormones are albumin bound, but DHEAS binding is much tighter. As a result, circulating concentrations of DHEAS are much higher (>100-fold) compared to DHEA. In most clinical situations, DHEA and DHEAS results can be used interchangeably. In gonads and several other tissues, most notably skin, steroid sulfatases can convert DHEAS back to DHEA, which can then be metabolized to stronger androgens and to estrogens.

 

During pregnancy, DHEA/DHEAS and their 16-hydroxylated metabolites are secreted by the fetal adrenal gland in large quantities. They serve as precursors for placental production of the dominant pregnancy estrogen, estriol. Within weeks after birth, DHEA/DHEAS levels fall by 80% or more and remain low until the onset of adrenarche at age 7 or 8 in girls and age 8 or 9 in boys. Adrenarche is a poorly understood phenomenon, peculiar to higher primates, that is characterized by a gradual rise in adrenal androgen production. It precedes puberty, but is not casually linked to it. Early adrenarche is not associated with early puberty or with any reduction in final height or overt androgenization. However, girls with early adrenarche may be at increased risk of polycystic ovarian syndrome as adults and some boys may develop early penile enlargement.

 

Following adrenarche, DHEA/DHEAS levels increase until the age of 20 to a maximum roughly comparable to that observed at birth. Levels then decline over the next 40 to 60 years to around 20% of peak levels. The clinical significance of this age-related drop is unknown and trials of DHEA/DHEAS replacement in the elderly have not produced convincing benefits. However, in young and old patients with primary adrenal failure, the addition of DHEA/DHEAS to corticosteroid replacement has been shown in some studies to improve mood, energy, and sex drive.

 

Elevated DHEA/DHEAS levels can cause symptoms or signs of hyperandrogenism in women. Men are usually asymptomatic, but through peripheral conversion of androgens to estrogens can occasionally experience mild estrogen excess. Most mild-to-moderate elevations in DHEAS levels are idiopathic. However, pronounced elevations of DHEA/DHEAS may be indicative of androgen-producing adrenal tumors. In small children, congenital adrenal hyperplasia (CAH) due to 3 beta-hydroxysteroid dehydrogenase deficiency is associated with excessive DHEA/DHEAS production. Lesser elevations may be observed in 21-hydroxylase deficiency (the most common form of CAH) and 11 beta-hydroxylase deficiency. By contrast, steroidogenic acute regulatory protein (STAR) or 17 alpha-hydroxylase deficiency is characterized by low DHEA/DHEAS levels.

 

See Steroid Pathways in Special Instructions.

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

Premature: <40 ng/mL*

0-1 day: <11 ng/mL*

2-6 days: <8.7 ng/mL*

7 days-1 month: <5.8 ng/mL*

>1-23 months: <2.9 ng/mL*

2-5 years: <2.3 ng/mL

6-10 years: <3.4 ng/mL

11-14 years: <5.0 ng/mL

15-18 years: <6.6 ng/mL

19-30 years: <13 ng/mL

31-40 years: <10 ng/mL

41-50 years: <8.0 ng/mL

51-60 years: <6.0 ng/mL

> or =61 years: <5.0 ng/mL

 

*Source: Dehydroepiandrosterone. In Pediatric Reference Ranges. 5th edition. Edited by SJ Soldin, C Brugnara, EC Wong. Washington, DC, AACC Press, 2005, p 75

Interpretation Provides information to assist in interpretation of the test results

Elevated dehydroepiandrosterone (DHEA)/dehydroepiandrosterone sulfate (DHEAS) levels indicate increased adrenal androgen production. Mild elevations in adults are usually idiopathic, but levels >5-fold or more of the upper limit of normal can suggest the presence of an androgen-secreting adrenal tumor. DHEA/DHEAS levels are elevated in >90% of patients with such tumors. This is particularly true for androgen-secreting adrenal carcinomas, as they have typically lost the ability to produce downstream androgens, such as testosterone. By contrast, androgen-secreting adrenal adenomas may also produce excess testosterone and secrete lesser amounts of DHEA/DHEAS.

 

Patients with congenital adrenal hyperplasia (CAH) may show very high levels of DHEA/DHEAS, often 5-fold to 10-fold elevations. However, with the possible exception of 3 beta-hydroxysteroid dehydrogenase deficiency, other steroid analytes offer better diagnostic accuracy than DHEA/DHEAS measurements. Consequently, DHEA/DHEAS testing should not be used as the primary tool for CAH diagnosis. Similarly, discovering a high DHEA/DHEAS level in an infant or child with symptoms or signs of possible CAH should prompt additional testing, as should the discovery of very high DHEA/DHEAS levels in an adult. In the latter case, adrenal tumors need to be excluded and additional adrenal steroid profile testing may assist in diagnosing nonclassical CAH.

 

See Steroid Pathways in Special Instructions.

Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances

Currently the correlation of serum dehydroepiandrosterone (DHEA)/dehydroepiandrosterone sulfate (DHEAS) level with human well-being or disease risk factors have not been completely established.

 

There are currently no established guidelines for DHEA/DHEAS replacement/supplementation therapy or its biochemical monitoring. In most settings, the value of DHEA/DHEAS therapy is doubtful. However, if DHEAS therapy is used, then it seems prudent to avoid overtreatment, with its associated hyperandrogenic effects. These are particularly likely to occur in postmenopausal females if DHEA/DHEAS levels approach or exceed the upper reference range. Most supplements contain DHEA, but the in vivo conversion to DHEAS allows monitoring of either DHEA or DHEAS.

Clinical Reference Provides recommendations for further in-depth reading of a clinical nature

1. Ibanez L, DiMartino-Nardi J, Potau N, Saenger P: Premature adrenarche-normal variant or forerunner of adult disease? Endocrine Rev 2001;40:1-16

2. Collett-Solberg P: Congenital adrenal hyperplasia: from genetics and biochemistry to clinical practice, Part I. Clin Pediatr 2001;40:1-16

3. Allolio B, Arlt W: DHEA treatment: myth or reality? Trends Endocrinol Metab 2002;13:288-294

4. Salek FS, Bigos KL, Kroboth PD: The influence of hormones and pharmaceutical agents on DHEA and DHEA-S concentrations: a review of clinical studies. J Clin Pharmacol 2002;42:247-266

Special Instructions and Forms Describes specimen collection and preparation information, test algorithms, and other information pertinent to test. Also includes pertinent information and consent forms to be used when requesting a particular test