Cystic Fibrosis (CFTR) 32 Mutations with Reflex to Sequencing and Reflex to Deletion/Duplication
2001967
Ordering Recommendation
This test is NOT indicated for routine obstetric screening. If the patient is not symptomatic, order Cystic Fibrosis (CFTR) 32 Mutations (2001933).
Mnemonic
CF COMPR
Methodology
Polymerase Chain Reaction/Oligonucleotide Ligation/Fragment Analysis/Sequencing/Multiplex Ligation-dependent Probe Amplification
Performed
Refer to individual components (2001933, 0051110 and 0051642)
Reported
7-35 days  
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
  
Collect
Lavender (EDTA), pink (K2EDTA), or yellow (ACD Solution A or B).  
Specimen Preparation
Transport 3 mL whole blood. (Min: 2 mL)  
Storage/Transport Temperature
Refrigerated.  
Unacceptable Conditions
  
Remarks
  
Stability
Ambient: 72 hours; Refrigerated: 1 week; Frozen: Unacceptable  
Reference Interval
By report  
Interpretive Data
Background information for Cystic Fibrosis (CFTR) 32 Mutations with Reflex to Sequencing and Reflex to Deletion/Duplication
Characteristics:
Chronic sino-pulmonary disease, gastrointestinal malabsorption/pancreatic insufficiency, and obstructive azoospermia. Findings are often limited to a single organ system such as isolated pancreatitis, bilateral absence of the vas deferens, nasal polyposis, or bronchiectasis in non-classic cystic fibrosis (CF).
Incidence of Classic CF:
1 in 3,000 Caucasians or Ashkenazi Jewish, 1 in 8,000 Hispanics, 1 in 15,000 African Americans, 1 in 32,000 Asians.
Incidence of Nonclassic CF:
Unknown.
Inheritance:
Autosomal recessive.
Penetrance:
High for severe mutations, variable for mild/moderate mutations.
Cause of Classic CF:
Two deleterious CFTR mutations on opposite chromosomes.
Cause of Nonclassic CF:
Typically one severe and one mild/moderate CFTR mutations on opposite chromosomes.
Mutations Tested in Panel:
G85E (c.254G>A), R117H (c.350G>A), R334W (c.1000C>T), R347P (c.1040G>C), R347H (c.1040G>A), 394delTT (c.262_263delTT), A455E (c.1364C>A), I507del (c.1519_1521delATC), F508del (c.1521_1523delCTT), V520F (c.1558G>T), G542X (c.1624G>T), S549N (c.1646G>A), S549R (c.1645A>C or c.1647T>G), G551D (c.1652G>A), R553X (c.1657C>T), R560T (c.1679G>C), 621+1G>T (c.489+1G>T), 711+1G>T (c.579+1G>T), 1078delT (c.948delT), R1162X (c.3484C>T), W1282X (c.3846G>A), N1303K (c.3909C>G), 1717-1G>A (c.1585-1G>A), 1898+1G>A (c.1766+1G>A), 2183AA>G (c.2051_2052delAAinsG), 2184delA (c.2052delA), 2789+5G>A (c.2657+5G>A), 3120+1G>A (c.2988+1G>A), 3659delC (c.3528delC), 3849+10kbC>T (c.3717+12191C>T), 3876delA (c.3744delA), 3905insT (c.3773_3774insT). For specimens positive for R117H, the IVS-8/poly T (c.1210-12T[5_9] is analyzed by sequencing. The mutations tested are listed above according to the legacy nomenclature; the standard nomenclature is listed in parentheses. Panel mutations are reported according to the legacy nomenclature.
Clinical Sensitivity for reflex:
99 percent.
Methodology for Panel:
PCR, oligonucleotide ligation assay (OLA), fluorescent hybridization probes, and capillary electrophoresis.
Methodology for Sequencing:
Bidirectional sequencing of the CFTR coding region and intron-exon boundaries.
Methodology for Deletion/Duplication:
Multiplex ligation-dependent probe amplification (MLPA) to detect large CFTR coding region deletions/duplications.
Analytical Sensitivity and Specificity:
99 percent.
Limitations:
Diagnostic errors can occur due to rare sequence variations. The breakpoints of large deletions/duplications will not be determined. Regulatory region and intronic mutations will not be detected.



Counseling and informed consent are recommended for genetic testing. Consent forms are available online at www.aruplab.com.

See Compliance Statement C: www.aruplab.com/CS  
Note
If only one pathogenic mutation is identified, then CFTR gene sequencing will be added. After CFTR gene sequencing, if less than two pathogenic mutations are identified, then CFTR deletion/duplication will be added. Additional charges apply.
CPT Code(s)
81220.  If reflexed to Seq, add 81223.  If reflexed to Del/Dup, add 81222
Components
Component Test Code*Component Chart Name
0050603Cystic Fibrosis (CFTR) R117H and 5T
0051151Cystic Fibrosis Symptom
0051483Cystic Fibrosis (CFTR) Allele 1
0051484Cystic Fibrosis (CFTR) Allele 2
0056003Cystic Fibrosis (CFTR) 5T Mutation
0056037Cystic Fibrosis Ethnicity
0056039Cystic Fibrosis Family History
2001341Cystic Fibrosis (CFTR) Pan,Seq,Del Spec
2002139Cystic Fibrosis Interpretation
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • CFTR mutation screening, sequencing and deletion/duplication