Cystic Fibrosis Rare Variant Analysis, One Exon

Test Code

10913

CPT Codes
81221

Includes

If amniotic fluid or chorionic villi sampling (CVS) is received, then an additional charge will be added for cell culture work (CPT code(s): 88235) if not already ordered

Preferred Specimen

4 mL whole blood collected in an EDTA (lavender-top) tube, EDTA (royal blue-top) tube, ACD (yellow-top) tube, or sodium heparin (green-top) tube

Minimum Volume

3 mL whole blood • 3 mL bone marrow • 10 mL amniotic fluid • Cultured cells 75% confluent • 10 mg chorionic villi

Other Acceptable Specimens

Bone marrow collected in: EDTA (lavender-top) tube, EDTA (royal blue-top) tube, ACD (yellow-top) tube, Sodium heparin (green-top) tube • Fetal specimens: 10 mL amniotic fluid collected in a sterile, leak-proof container • Amniocyte or chorionic villus (CVS) culture cells collected in each of two sterile T25 flasks • 10 mg dissected chorionic villus (CVS) biopsy collected in a sterile tube filled with sterile culture media

Instructions

Do not hold specimen; forward to laboratory when specimen arrives. Contact performing laboratory for stability determination. For any other sample type call 866-GENE-INFO (1-866-436-3463).

Whole blood: Normal phlebotomy procedure. Specimen stability is crucial. Store and ship at room temperature immediately. Do not freeze.

For fetal testing:
1) Please call 1-866-GENE-INFO (1-866-436-3463) prior to submission.
2) Documentation of parental carrier status must be provided.
3) It is required that Maternal Cell Contamination Study, STR Analysis be ordered in conjunction with fetal testing. A separate tube of maternal blood (EDTA) is required for this test.

Note: Do not reject. Forward to performing laboratory for evaluation of sample.

Amniotic fluid: Normal collection procedure. Specimen stability is crucial. Store and ship at room temperature immediately. Do not refrigerate or freeze; forward to laboratory when sample arrives.

Amniocyte or chorionic villus (CVS) culture: Two sterile T25 flasks, 75% confluent, filled with culture medium. Specimen stability is crucial. Store and ship at room temperature immediately. Do not refrigerate or freeze; forward to laboratory when cells arrive.

Dissected chorionic villus (CVS) biopsy: 10-20 mg dissected chorionic villi collected in sterile tube filled with sterile culture media. Specimen stability is crucial. Store and ship at room temperature immediately. Do not refrigerate or freeze; forward to laboratory when sample arrives.

Transport Container

EDTA (lavender-top) tube • EDTA (royal blue-top) tube • ACD (yellow-top) tube • Sodium heparin (green-top) tube

Transport Temperature

Room temperature

Specimen Stability

Whole blood
Room temperature: 14 days
Refrigerated: 14 days
Frozen: Unacceptable

Bone marrow
Room temperature: 8 days
Refrigerated: 8 days
Frozen: Unacceptable

Fetal specimens
Room temperature: 48 hours
Refrigerated: Unacceptable
Frozen: Unacceptable

Methodology
Next Generation Sequencing

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule

a.m. As needed

Clinical Significance

This test is utilized when there is a specific known familial variant in one exon (a specific region of the CFTR gene) that is not included in a targeted cystic fibrosis mutation panel. This test is not recommended for routine carrier screening.

The recommended test for routine CF carrier screening analyzes an expanded number of variants that are known to cause CF. If there are questions about which test is most appropriate, or if a carrier screening panel that includes CF is desired, please see the Quest Test Directory for panel options and/or contact 866-GENE-INFO (866-436-3463) for assistance.

Performing Laboratory

Quest Diagnostics Nichols Institute-San Juan Capistrano, CA

33608 Ortega Highway

San Juan Capistrano, CA 92675-2042

Last Updated: November 6, 2024

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.