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Hypogonadotropic Hypogonadism/Kallmann Syndrome via the IL17RD Gene

Summary and Pricing

Test Method

Exome Sequencing with CNV Detection
Test Code Test Copy GenesTest CPT Code Gene CPT Codes Copy CPT Codes Base Price
11895 IL17RD 81479 81479,81479 $890 Order Options and Pricing
Test Code Test Copy Genes Test CPT Code Gene CPT Codes Copy CPT Code Base Price
11895IL17RD81479 81479,81479 $890 Order Options and Pricing

An additional 25% charge will be applied to STAT orders. STAT orders are prioritized throughout the testing process.

Click here for costs to reflex to whole PGxome (if original test is on PGxome Sequencing backbone).

Click here for costs to reflex to whole PGnome (if original test is on PGnome Sequencing backbone).

Turnaround Time

3 weeks on average for standard orders or 2 weeks on average for STAT orders.

Please note: Once the testing process begins, an Estimated Report Date (ERD) range will be displayed in the portal. This is the most accurate prediction of when your report will be complete and may differ from the average TAT published on our website. About 85% of our tests will be reported within or before the ERD range. We will notify you of significant delays or holds which will impact the ERD. Learn more about turnaround times here.

Targeted Testing

For ordering sequencing of targeted known variants, go to our Targeted Variants page.


Genetic Counselors


  • Fang Xu, PhD, FACMG

Clinical Features and Genetics

Clinical Features

Hypogonadotropic hypogonadism (HH), also known as gonadotropin-releasing hormone (GnRH) deficiency (IGD), is a genetic condition that is characterized by delayed or absent sexual development and infertility due to an impaired secretion of gonadotropins. Hypogonadotropic hypogonadism is divided into two major clinical phenotypes depending on the presence of an intact sense of smell: anosmic hypogonadotropic hypogonadism (Kallmann syndrome, KS) and normosmic hypogonadotropic hypogonadism (nHH) (Marino et al. 2014. PubMed ID: 25254043; Boehm et al. 2015. PubMed ID: 26194704; Kim. 2015. PubMed ID: 26790381; Balasubramanian and Crowly. 2017. PubMed ID: 20301509). The prevalence of HH has been estimated to range from 1:10,000 to 1:86,000 individuals depending on different populations (for example 1:10,000 in French and 1:86,000 in Sardinian). A recent study in Finland showed a minimal incidence of KS which accounts for nearly two thirds of individuals with HH of 1:30,000 in males and 1:125,000 in females (Laitinen et al. 2011. PubMed ID: 21682876). Males predominate in HH with a male-to-female ratio of nearly 4:1 (Seminara et al. 1998. PubMed ID: 9793755).

HH is typically diagnosed in patients presenting with absent or incomplete puberty, low serum testosterone or estradiol due to absence of circulating gonadotropins LH (luteinizing hormone) and FSH (follicle-stimulating hormone), but no other abnormalities of the hypothalamic-pituitary axis (Balasubramanian and Crowley. 2017. PubMed ID: 20301509). Infant boys with HH often demonstrate micropenis and cryptorchidism. Adult males with HH present failure to undergo normal puberty and absence of secondary sexual characteristics. Females with HH usually have little or no breast development, primary amenorrhea or infertility. In addition to reproductive symptoms, many KS patients exhibit a wide variety of additional signs and symptoms. Commonly recognized non-reproductive features that may be present in KS patients include: digital synkinesia, unilateral renal agenesis, cleft lip and/or palate, dental agenesis, hearing loss, and abnormal eye movements (Kaplan et al. 2010. PubMed ID: 20949504; Layman 2013. PubMed ID: 23650337; Balasubramanian and Crowley. 2017. PubMed ID: 20301509).

Hormone replacement with testosterone in males and estrogen in females is the classic treatment for hypogonadism. Hypogonadotropic hypogonadism is one of the rare conditions in which specific medical treatment can reverse infertility. Early intervention can promote the development of and maintain secondary sexual characteristics and normal sexual function, prevent low bone density and related complications, and also provides the opportunity for fertility (Boehm et al. 2015. PubMed ID: 26194704).


HH is a clinically and genetically heterogeneous disorder. To date, pathogenic variants in more than 35 genes, including IL17RD, account for about half of all HH. These genes are known to be involved in the formation and migration of GnRH and olfactory neurons. Pathogenic variants in these genes have been reported to disrupt the migratory pathway of GnRH and olfactory neurons from the nasal region into the hypothalamus.

Homozygous missense variants in IL17RD have been reported in HH/KS individuals and were strongly linked to hearing loss, indicating autosomal recessive inheritance (Miraoui et al. 2013. PubMed ID: 23643382). However, heterozygous missense variants in IL17RD have also been reported in HH/KS individuals, indicating autosomal dominant inheritance ( Miraoui et al. 2013. PubMed ID: 23643382 ; Zhou et al. 2018. PubMed ID: 30098700; Cassatella et al. 2018. PubMed ID: 29419413).

IL17RD encodes a single transmembrane glycoprotein belonging to the interleukin -17 receptor protein family. It is one of the major antagonists of FGF downstream signaling. IL17RD is coexpressed with FGF8 in the olfactory placode during embryogenesis, suggesting a potential role in the early development of both GnRH and olfactory neurons (Miraoui et al. 2013. PubMed ID: 23643382).

Clinical Sensitivity - Sequencing with CNV PGxome

Pathogenic variants in IL17RD have been reported in ~3.4% of individuals with Kallmann syndrome/Hypogonadotropic hypogonadism (Zhou et al. 2018. PubMed ID: 30098700).

Testing Strategy

This test provides full coverage of all coding exons of the IL17RD gene plus 10 bases of flanking noncoding DNA in all available transcripts along with other non-coding regions in which pathogenic variants have been identified at PreventionGenetics or reported elsewhere. We define full coverage as >20X NGS reads or Sanger sequencing. PGnome panels typically provide slightly increased coverage over the PGxome equivalent. PGnome sequencing panels have the added benefit of additional analysis and reporting of deep intronic regions (where applicable).

Dependent on the sequencing backbone selected for this testing, discounted reflex testing to any other similar backbone-based test is available (i.e., PGxome panel to whole PGxome; PGnome panel to whole PGnome).

Indications for Test

Candidates for this test are patients with symptoms consistent with hypogonadotropic hypogonadism/Kallmann syndrome. This test may also be considered for the reproductive partners of individuals who carry pathogenic variants in IL17RD.


Official Gene Symbol OMIM ID
IL17RD 606807
Inheritance Abbreviation
Autosomal Dominant AD
Autosomal Recessive AR
X-Linked XL
Mitochondrial MT


Name Inheritance OMIM ID
Hypogonadotropic Hypogonadism 18 with or without Anosmia AD, AR 615267

Related Tests

Female Infertility Panel
Hypogonadotropic Hypogonadism/Kallmann Syndrome Panel
Kallmann Syndrome (KS) Panel


  • Balasubramanian and Crowley. 2017. PubMed ID: 20301509
  • Boehm et al. 2015. PubMed ID: 26194704
  • Cassatella et al. 2018. PubMed ID: 29419413
  • Kaplan et al. 2010. PubMed ID: 20949504
  • Kim. 2015. PubMed ID: 26790381
  • Laitinen et al. 2011. PubMed ID: 21682876
  • Layman. 2013. PubMed ID: 23650337
  • Marino et al. 2014. PubMed ID: 25254043
  • Miraoui et al. 2013. PubMed ID: 23643382
  • Seminara et al. 1998. PubMed ID: 9793755
  • Zhou et al. 2018. PubMed ID: 30098700


Ordering Options

We offer several options when ordering sequencing tests. For more information on these options, see our Ordering Instructions page. To view available options, click on the Order Options button within the test description.

myPrevent - Online Ordering

  • The test can be added to your online orders in the Summary and Pricing section.
  • Once the test has been added log in to myPrevent to fill out an online requisition form.
  • PGnome sequencing panels can be ordered via the myPrevent portal only at this time.

Requisition Form

  • A completed requisition form must accompany all specimens.
  • Billing information along with specimen and shipping instructions are within the requisition form.
  • All testing must be ordered by a qualified healthcare provider.

For Requisition Forms, visit our Forms page

Specimen Types

Specimen Requirements and Shipping Details

PGxome (Exome) Sequencing Panel

PGnome (Genome) Sequencing Panel

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View Ordering Instructions

1) Select Test Method (Backbone)

1) Select Test Type

2) Select Additional Test Options

STAT and Prenatal Test Options are not available with Patient Plus.

No Additional Test Options are available for this test.

Note: acceptable specimen types are whole blood and DNA from whole blood only.
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