Test Directory

Clear All
Test Code
5390
Test Name
Xeroderma Pigmentosum 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

Xeroderma pigmentosum is a rare autosomal recessive genodermatosis caused by a genetic defect in components of the nucleotide excision repair pathway. It is characterized by extreme sensitivity to ultraviolet light which leads to the development of multiple skin cancers. Other common findings include photophobia, conjunctivitis, keratitis, skin photosensitivity, and atrophy of the skin. Approximately 25 to 30% of individuals with XP have neurological abnormalities. They include microcephaly, hyporeflexia, spasticity, ataxia, seizures, sensorineural hearing loss, and progressive cognitive impairment.

The Xeroderma pigmentosum NGS panel consists of nine genes: DDB2, ERCC1, ERCC2, ERCC3, ERCC4, ERCC5, POLH, XPA and XPC.

Gene

Disorder

MIM

Inheritance

DDB2

Xeroderma pigmentosum, complementation group E (XPE)

278740

AR

ERCC1

Xeroderma pigmentosum, ERCC1 related

-

AR

ERCC2

Xeroderma pigmentosum, complementation group D (XPD)

278730

AR

ERCC3

Xeroderma pigmentosum, complementation group B (XPB)

610651

AR

ERCC4

Xeroderma pigmentosum, complementation group F (XPF)

278760

AR

ERCC5

Xeroderma pigmentosum, complementation group G (XPG)

278780

AR

POLH

Xeroderma pigmentosum, variant type (XPV)

278750

AR

XPA

Xeroderma pigmentosum, complementation group A (XPA)

278700

AR

XPC

Xeroderma pigmentosum, complementation group C (XPC)

278720

AR

 

 

 
Testing Schedule
Monday-Friday
Genes
DDB2, ERCC1, ERCC2, ERCC3, ERCC4, ERCC5, POLH, XPA, XPC
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.
© 2026 HNL Lab Medicine. All rights reserved.