Please be sure to review ALL instructions below that apply to your specimen(s).

Specimens Submitted from North America

Non-Prenatal Specimens for Diagnostic Testing: Please send ONE of the following types of specimens:
  • Whole blood: purple-top (EDTA) tube, minimum of 3 ml.  Whole blood should be stored at 4°C until shipped.

  • Genomic DNA*:  minimum of 3 µg (at a concentration of at least 30 ng/µl), preferably in TE solution.

  • Fibroblasts: minimum of 2 confluent T-25 flasks. Please fill all flasks to capacity with cell culture media.

  • Saliva:  Saliva for CNV (highly recommend whole blood for CNV). Only samples collected in Oragene DNA Self-Collection Kit or Oragene Saliva Collection Kit for Young Children are accepted (www.dnagenotek.com).

Non-Prenatal Specimens for Carrier Screening: Please send ONE of the following types of specimens:

  • Whole blood: purple-top (EDTA) tube, minimum of 3 ml.  Whole blood should be stored at 4°C until shipped.

  • Genomic DNA*:  minimum of 3 µg (at a concentration of at least 30 ng/µl), preferably in TE solution.

Prenatal Specimens for Diagnostic Testing: Please send ONE of the following types of specimens:

  • Cultured cells: minimum of 2 confluent T-25 flasks derived from amnio or CVS samples.  Please fill all flasks to capacity with cell culture media.

  • Genomic DNA*:  minimum of 3 µg (at a concentration of at least 30 ng/µl), preferably in TE solution.

CTGT highly recommends including a maternal sample for maternal cell contamination studies with all prenatal tests. Maternal sample requirements are as listed above in the Non-Prenatal Specimens section.

Specimens from Outside of North America

  • Please send genomic DNA*:  a minimum of 3 µg (at a concentration of at least 30 ng/µl), preferably in TE solution.

CTGT does not recommend shipping whole blood or cultured cells from any location other than the United States, Canada or Mexico.

Technical Guidelines

If any of the guidelines for these processes are not met, the specimen may be rejected, or the test may be placed on hold. CTGT will contact the client for resolution.
The following list represents some possible causes for specimen rejection:

  • Improperly labeled specimen (minimum of two patient identifiers).

  • Inappropriate specimen type (genomic DNA isolated from FFPE specimen is not accepted).

  • Incomplete or incorrect test request form (i.e. no test marked).

  • Insufficient volume for analysis.

  • Specimen has leaked in transit.

  • Specimen without a test order.

  • All sample types should be shipped at ambient temperature via an overnight courier.

  • Please review the instructions on the Shipping page to ensure that your shipment is received in good condition by CTGT.

  • Please note that genomic DNA is accepted only from CLIA-certified laboratories or laboratories meeting equivalent requirements.

  • Please note that genomic DNA isolated from FFPE specimens is not accepted.

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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