CPT® Code 81251

The CPT® Code 81251 pertains to the molecular genetic testing for the GBA (glucosidase, beta, acid) gene, which is crucial in diagnosing Gaucher disease. Gaucher disease is a type of lysosomal storage disorder that arises due to a deficiency of the enzyme glucocerebrosidase, which is essential for the breakdown of glucocerebroside, a lipid substance. When this enzyme is absent or deficient, glucocerebroside accumulates in various organs, including the liver, kidneys, spleen, bones, brain, and lungs, leading to a range of health complications. This condition is inherited in an autosomal recessive manner, meaning that an individual must inherit two copies of the mutated gene—one from each parent—to develop the disease. Those who inherit only one mutated copy become carriers and typically do not exhibit symptoms. The GBA gene has at least 25 known variants, with four common mutations: N370S, 84GG, L444P, and IVS2+1G>A. The specific combination of these variants can significantly affect the clinical presentation of Gaucher disease. For instance, individuals with the N370S/N370S genotype often experience non-neuropathic Type 1 Gaucher disease, which may present with mild or no symptoms. In contrast, combinations involving N370S with other variants can lead to more severe forms of the disease, such as Type 2 or Type 3, which are characterized by neurological involvement. The prevalence of Gaucher disease is notably higher among individuals of Ashkenazi Jewish descent, with a rate of approximately 1 in 450, compared to the general population, where the incidence is estimated at 1 in 50,000 to 100,000. Symptoms can vary widely and may include bone fractures, fatigue, heart valve issues, lung complications, skin discoloration, yellow fat deposits in the eyes, lymphadenopathy, joint swelling, painful bone lesions, thrombocytopenia, and severe edema in newborns. Treatment options include enzyme replacement therapy with intravenous glucocerebrosidase (imiglucerase) or velaglucerase alfa. Molecular genetic testing is recommended for individuals exhibiting symptoms of Gaucher disease or those with a family history of the condition, facilitating early diagnosis and management.