Carrier screening or diagnostic testing for ABCC8-related hyperinsulinism for individuals of Ashkenazi Jewish descent.
Polymerase Chain Reaction/Fluorescence Monitoring
Lavender (EDTA), Pink (K2EDTA), yellow (ACD Solution A or B).
Transport 3 mL whole blood. (Min: 1 mL)
Plasma or serum. Specimens collected in sodium heparin or lithium heparin tubes.
Ambient: 72 hours; Refrigerated: 2 weeks; Frozen: 1 month
Background Information for ABCC8-Related Hyperinsulinism, 3 Variants:
Characteristics: ABCC8-related hyperinsulinism is characterized by hypoglycemia varying in severity from mild symptoms to severe neonatal-onset. Infants with the severe neonatal-onset present with hypoglycemia within the first few days of life, which progresses causing seizures, brain damage and death if untreated.
Incidence: 1 in 10,800 in Ashkenazi Jewish individuals.
Inheritance: Autosomal recessive.
Cause: ABCC8 pathogenic variants.
Variants Tested: p.F1388del (c.4163_4165del), p.V187D (c.560T>A), c.3992-9G>A.
Clinical Sensitivity: 97 percent in Ashkenazi Jewish individuals; unknown in other ethnicities.
Methodology: Polymerase chain reaction (PCR) and fluorescence monitoring.
Analytical Sensitivity and Specificity: Greater than 99 percent.
Limitations: Variants other than those tested will not be detected. Diagnostic errors can occur due to rare sequence variations.
Laboratory Developed Test (LDT)
|Component Test Code*||Component Chart Name||LOINC|
|2013726||ABCC-8 Related Hyperinsulinism, Specimen||31208-2|
|2013727||ABCC-8 Related Hyperinsulinism, Allele 1||38918-9|
|2013728||ABCC-8 Related Hyperinsulinism, Allele 2||38918-9|
|2013729||ABCC-8 Related Hyperinsulinism, Interp||50398-7|