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Laboratory Test Directory

Chromosome 15 Uniparental Disomy Analysis (UPD15)


Name Method Department Units
Chromosome 15 Uniparental Disomy Analysis (UPD15) Capillary electrophoresis
Polymerase chain reaction (PCR)
DNA extraction
Molecular Genetics

Specimen Requirements

Whole blood

Container Type Container Size Specimen Volume

Purple tube (EDTA)

4 mL 4 mL-8 mL

Room temperature - 24 hour(s)
Refrigerated - 72 hour(s)

Specimen Preparation

  • Do not centrifuge
  • Do not freeze

Reasons for Rejection

  • Centrifuged specimen
  • Clotted specimen
  • Frozen specimen
  • Wrong collection tube
  • Delayed or improper handling


This test detects the presence of uniparental disomy for chromosome 15 (UPD15). Maternal UPD15 causes Prader-Willi syndrome, while paternal UPD15 causes Angelman syndrome. UPD causes approximately 25% of cases of Prader-Willi syndrome and approximately 7% of cases of Angelman syndrome.

This test should only be ordered for patients who had an ABNORMAL Prader-Willi/Angelman syndrome methylation analysis (methylation-specific SNRPN PCR assay; test code: PWSASMETHYL), as well as NORMAL 15q deletion testing by FISH (test code: FISHON) or microarray analysis (test code: SNPMA).

Peripheral blood sample (4-8 mL EDTA) from at least one biological parent must be submitted along with the patient sample. Sample submission from both biological parents will yield the most informative result. Please label each parent's blood sample with parent's name and date of birth; each family member's sample should be placed in a separate biohazard bag.

Please click on the Lab Form Link in the Forms Section to print and complete the Genetic Test Requisition Form. Please complete a separate Genetic Test Requisition Form for patient and each parent. Submission of completed Genetic Test Requisition Form is required, and submission of informed consent form is recommended (but not required). Please call (614) 722-2866 with questions.


Lab Form

CPT Code

  • 81402