Alagille syndrome laboratory findings
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
In addition to various imaging modalities, laboratory tests may be conducted evaluating the bilirubin levels. A liver biopsy may also be conducted on the bile duct to further supplement bilirubin testing.
Laboratory Findings
Biochemical Evaluation
Total Bilirubin >6.5 mg/dL, Conjugated Bilirubin >4.5 mg/dL, and cholesterol >520 mg/dL in children younger than 5 years of age are likely be associated with severe liver disease in later life [1].
Molecular genetic testing
Sequence analysis of JAG1 detects mutation in 90% of individuals with symptoms. Around 7% of affected individuals have microdeletion of 20p12. Mutations in NOTCH2 is found in less than 1%. If family-specific mutation is known, molecular genetic testing is offered to first-degree relatives.
Prenatal testing
Prenatal testing for pregnancies at increased risk is possible if the JAG1 or NOTCH2 disease-causing mutation in an affected family member is known. Prenatal testing cannot predict the occurrence or severity of clinical manifestations.
References
- ↑ Kamath BM, Munoz PS, Bab N, Baker A, Chen Z, Spinner NB; et al. (2010). "A longitudinal study to identify laboratory predictors of liver disease outcome in Alagille syndrome". J Pediatr Gastroenterol Nutr. 50 (5): 526–30. doi:10.1097/MPG.0b013e3181cea48d. PMC 2861305. PMID 20421762.