Ordering an add-on test

An "Add-on Test" is a request to add an additional test to a previously tested patient specimen. 

Sample sufficiency

In some cases, CTGT may not have enough DNA remaining from the previously tested specimen to perform the add-on test. CTGT highly recommends contacting us to confirm that there is a sufficient amount of DNA prior to ordering an add-on test. If an add-on test request is received and there is not enough DNA to perform the test, phone and/or email notification will be provided within 24 hours of receipt of the add-on request. For cases with an insufficient amount of DNA, a new sample is required in order to perform the test.  Add-on tests may be requested for all specimen types, including prenatal specimens.

Requisition form

CTGT does not provide a separate requisition form for add-on tests. To order an add-on test, complete our standard requisition form, including payment information, and note in the “Special Test Instructions” section on the last page of the requisition form that the order is for an add-on test.  Fax the completed requisition form to CTGT at 484-244-2904. 

For institutional billing, CTGT highly recommends that the add-on test is requested through the institutional Sendout Department, which initially sent the patient sample. An add-on test CANNOT be properly processed, if the Sendout Department has not been notified. CTGT will begin testing when a requisition form is received from the Sendout Department. 

Turnaround time

Our standard turnaround times (approximately 1-2 weeks for Sanger sequencing, approximately 2-3 weeks for deletion/duplication tests and 2-4 weeks for NextGen sequencing) also apply to add-on tests.

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. HNL Lab Medicine strongly recommends confirmation of CPT codes with third-party payors and/or the AMA. We assume no responsibility for billing errors due to reliance upon CPT codes provided by HNL Lab Medicine.

What's New

October 13, 2021

CTGT.net: A New Website Experience

We've refreshed our look and feel to better meet your needs. 

CTGT's new website is not only user-friendly but also provides more advanced test search capabilities, additional methodologies, and a clean design suited for multi-platform usage.

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September 28, 2021

9 New Tests for Genetic Carrier Screening Panels

CTGT is now offering 9 NEW tests for Genetic Carrier Screening. 
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September 25, 2021

New York State Clinical Laboratory Permit Approval

CTGT is proud to announce that its CLIA licensed and CAP-accredited Pennsylvania laboratory has earned a New York State Department of Health clinical laboratory permit to perform genetic testing for patients residing within the state of New York. 
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September 23, 2021

California Department of Public Health Clinical Laboratory License Approval

CTGT is proud to announce that its CLIA licensed and CAP-accredited Pennsylvania laboratory is now licensed by the California Department of Public Health to perform genetic testing for patients residing within the state of California. 
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September 20, 2021

Patient Insurance Billing, Prior Authorization, and Benefit Investigation

CTGT is dedicated to providing accessible, affordable, and high-quality lab services.
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