| Interpretive Data: |
Background Information for Hemophilia A (F8) Deletion/Duplication:
Characteristics: Severe deficiency of factor VIII clotting activity leading to spontaneous joint or deep muscle bleeding. Moderate to mild deficiency is associated with prolonged bleeding after tooth extractions, surgery, or injuries and recurrent or delayed wound healing.
Incidence: 1 in 4,000-5,000 live male births worldwide, rare in females.
Inheritance: X-linked recessive. Of simplex cases, 85 percent of mothers are carriers and 10-15 percent of boys have a de novo mutation.
Penetrance: 100 percent in males and 10 percent in females.
Cause: Deleterious F8 gene mutations.
Clinical Sensitivity: 6 percent of mutations causing severe hemophilia A and <1 percent of mild to moderate hemophilia A mutations are detected by deletion/duplication testing.
Methodology: Multiplex ligation-dependent probe amplification (MLPA) to detect large F8 coding region deletions/duplications.
Analytical Sensitivity & Specificity: 99 percent.
Limitations: Rare diagnostic errors can occur due to probe site mutations. Breakpoints for large deletions/duplications will not be determined. F8 base pair substitutions, small deletions/duplications, deep intronic, and regulatory region mutations will not be detected.
Counseling and informed consent are recommended for genetic testing. Consent forms are available online at www.aruplab.com.
Refer to Statement C under Testing Information at http://www.aruplab.com.
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| CPT Code(s): |
83891 Isolation; 83896 Nucleic acid probes; 83898 Amplification; 83914 Extension; 83909 Capillary electrophoresis; 83912 Interpretation and report - Additional CPT code modifiers may be required for procedures performed to test for oncologic or inherited disorders.
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Cross References: |
F8 (Hemophilia A (F8) Deletion/Duplication)
, Factor VIII (Hemophilia A (F8) Deletion/Duplication)
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