Clinics and Departments

Laboratory Services

Lab Dept:

Anatomic Pathology

Test Name:


General Information

Lab Order Codes:



RTS Broad Thumb ; Rubenstein-Taybi Syndrome, Comprehensive; Hallux Syndrome

CPT Codes:

81479 – Molecular Pathology Unlisted procedure

Test Includes:

An interpretive report will be provided.


Test Indications:

Mutations in the CREBBP gene cause Rubinstein-Taybi syndrome. The CREBBP gene makes a protein that helps control the activity of many other genes. The protein, called CREB binding protein, plays an important role in regulation cell growth and division and is essential for normal fetal development. If one copy of the CREBBP gene is deleted or mutated, cells make only half of the normal amount of CREB binding protein. A reduction in the amount of this protein disrupts normal development before and after birth, leading to the sign and symptoms of Rubinstein-Taybi syndrome. Mutations in the EP300 gene are responsible for a small percentage of cases of Rubenstein-Taybi syndrome. These mutations result in the loss of one copy of the gene in each cell, which reduces the amount of p300 protein by half. Some mutations lead to the production of a very short, nonfunctional version of the p300 protein, while others prevent one copy of the gene from making any protein at all. Although researchers do not know how a reduction in the amount of p300 protein leads to the specific features of Rubinstein-Taybi syndrome, it is clear that the loss of one copy of the EP300 gene disrupts normal development.

Lab Testing Sections:

Anatomic Pathology – Sendouts

Referred to:

University of Colorado Denver DNA Diagnostics Lab

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Monday – Thursday Only

Note: Specimens should be received in the UCD DNA Diagnostic Laboratory within 72 hours of collection if possible. The laboratory is closed on Saturdays and Sundays. Ideally, specimens should be collected and shipped early in the week to avoid delivery on a weekend.

Turnaround Time:

2 - 4 weeks

Special Instructions:

Restricted draw times. See Test Availability. Specimens received without a
requisition including signed consent are held after DNA extraction. Tests that are cancelled after DNA extraction will be charged $75.00.

Requisition and Consent forms
can be printed from this link.

Parental samples are performed free of charge when sent with child's sample. Parental samples must also be accompanied a requisition and signed consent form.


Specimen Type:

Whole Blood


Lavender (EDTA) top tube

Draw Volume:

5 mL (Minimum: 2 mL) EDTA whole blood

Newborns: 1 mL will be accepted

Processed Volume:

Same as Draw Volume


Routine venipuncture

Special Processing:

Lab Staff: Do not centrifuge, specimen should remain in original collection container. Specimen must be received by reference lab within 72 hours. Lab is closed Saturday and Sunday and on certain holidays. Store at room temperature and ship promptly by overnight delivery.

Ship to: UCD DNA Diagnostic Laboratory
Room P18-4404K
12800 East 19th Avenue
Aurora, CO 80045

Patient Preparation:


Sample Rejection:

Mislabeled or unlabeled specimens


Reference Range:

An interpretive report will be provided

Critical Values:



Transfusions of whole blood prior to peripheral blood collection may result in an inconclusive interpretation


DNA extraction and gene sequencing


University of Colorado Denver DNA Diagnostics Laboratory January 2011
Phone: 303-724-3801
Fax: 303-724-3802


2/11/2013: CPT update

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