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Test Code
5375
Test Name
Erythrokeratodermias And Related Disorders NGS Panel
CPT Codes
81479
Expected Turnaround Time
Typically 2 to 4 weeks from receipt of a sample in the laboratory. All cases involving ongoing pregnancies will be expedited.
Clinical Utility
Genetic analysis to provide a molecular diagnosis of this disorder. Recommended for individuals with a personal and/or family history of this disorder to ensure appropriate treatment and establish recurrence risk for family members.
Specimen and Container Info

Non-Prenatal Specimens

Preferred/Alternate

Specimen Type

Containers

Volume

Preferred Specimen Type

Whole Blood

Lavender Top (EDTA)

3 mL

Alternate Specimen Type

Genomic DNA

1.5 mL Tube

3 µg (at a concentration of at least 30 ng/µl), preferably in TE solution.

Alternate Specimen Type

Fibroblasts

T-25 Flasks

2 confluent T-25 flasks, filled to capacity

Alternate Specimen Type

Saliva (Whole blood is recommended for CNV)

DNA Self-Collection Kit or Oragene Saliva Collection Kit for Young Children

Follow kit instructions (www.dnagenotek.com)

Prenatal Specimens

Either specimen type below is acceptable.

Specimen Type

Containers

Volume

Cultured cells

T-25 Flasks

2 confluent T-25 flasks derived from amnio or CVS samples.

Genomic DNA

1.5 mL Tube

3 µg (at a concentration of at least 30 ng/µl), preferably in TE solution.

NOTE: For specimens from outside of North America, the preferred specimen type is Genomic DNA. HNL Genomics does not recommend shipping whole blood or cultured cells from any location other than the United States, Canada, or Mexico.
Transport Instructions
  • Transport at room temperature within 24 hours.
  • If the specimen cannot be transported to the lab within 24 hours, refrigerate for up to 72 hours.
  • Do not freeze or expose to extreme temperatures, refrigerate for up to 72 hours if cannot be transported to lab within 24 hours. 
Stability Requirements

Room Temperature

24 hours

Refrigerated

72 hours
Causes for Rejection
  • Improperly labeled specimen (minimum of two patient identifiers)
  • Inappropriate specimen type
  • Incomplete or incorrect test request form
  • Insufficient volume
  • Specimen has leaked in transit
  • Specimen without a test order
Methodology
Next Generation Sequencing and Copy Number Variation Analysis
Performing Location
Genomics - Snowdrift
Description

Erythrokeratodermias are a clinically and genetically heterogeneous group of skin disorders. They are characterized by localized or generalized erythematous hyperkeratotic plaques. The findings are limited to skin in erythrokeratodermia variabilis et progressiva and Vohwinkel syndrome. The erythrokeratodermias and related disorders NGS panel consists of seven genes: DSP, GJA1, GJB3, GJB4, KDSR, KRT83 and LOR.

In DSP related disorders additional findings can include dilated cardiomyopathy with woolly hair, keratoderma, and tooth agenesis.

Gene

Disorder

MIM

Inheritance

DSP

Dilated cardiomyopathy with woolly hair, keratoderma,

and tooth agenesis (DCWHKTA)

615821

AD

GJA1

Erythrokeratodermia variabilis et progressiva 3 (EKVP3)

617525

AD

GJB3

Erythrokeratodermia variabilis et progressiva 1 (EKVP1)

133200

AD / AR

GJB4

Erythrokeratodermia variabilis et progressiva 2 (EKVP2)

617524

AD

KDSR

Erythrokeratodermia variabilis et progressiva 4 (EKVP4)

617526

AR

KRT83

Erythrokeratodermia variabilis et progressiva 5 (EKVP5)

617756

AR

LOR

Vohwinkel syndrome, variant form

604117

AD

 

 
Testing Schedule
Monday-Friday
Genes
DSP, GJA1, GJB3, GJB4, KDSR, KRT83, LOR
Disease Group
Hair and Nail disorders, Skin, Tooth
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
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