CPT® Code 81256

Molecular genetic testing is a critical diagnostic tool used to identify specific mutations in the HFE gene that are associated with hereditary hemochromatosis, a condition characterized by excessive iron absorption from dietary sources. Hemochromatosis is classified as an iron overload disease, where the body accumulates excess iron, leading to potential damage to various organs and tissues. The HFE gene, located on chromosome 6, plays a significant role in regulating iron absorption in the intestines. When mutations occur in this gene, particularly in the common variants known as C282Y and H63D, the normal function of the HFE protein is disrupted. The HFE protein, which does not have an immunological role, fails to form a stable complex with beta-2-microglobulin due to the mutation, resulting in its degradation before it can be incorporated into the cell membrane. This malfunction leads to an erroneous signal of iron deficiency, prompting the intestines to increase iron absorption, thereby exacerbating the iron overload condition. Hereditary hemochromatosis follows an autosomal recessive inheritance pattern, meaning that individuals must inherit mutations from both parents to develop the disease. Those who inherit a mutation from only one parent are considered carriers and may not exhibit symptoms. The C282Y variant is particularly significant, as it is found in 60-90% of diagnosed cases and typically leads to more pronounced symptoms. In contrast, the H63D variant may present with milder or even asymptomatic conditions when homozygous. The accumulation of excess iron can lead to severe complications, particularly affecting the liver, pancreas, and heart. Therefore, molecular genetic testing is indicated for individuals exhibiting symptoms of hemochromatosis or those with a family history of the disease, facilitating early diagnosis and management of this potentially serious condition.