Hexosaminidase activity in white blood cells (WBCs)

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms like developmental delays, intellectual disability, or neurological issues that could be linked to enzyme deficiencies. It’s particularly useful for screening or confirming conditions like Tay-Sachs disease, which affects hexosaminidase levels.

What to Expect Before the Test

No special preparation is needed. The test involves drawing a small amount of blood from a vein in your arm, similar to other blood tests. You may feel a slight pinch, but it usually doesn’t cause discomfort.

What the Test Results Mean

Results are compared to a reference range for healthy individuals. Lower than expected levels may indicate an enzyme deficiency, while higher levels may not be clinically significant unless part of a broader evaluation.

Possible Conditions Linked to Abnormal Results

Abnormally low hexosaminidase activity can be associated with lysosomal storage disorders, such as Tay-Sachs disease, which affects nerve cells and can cause severe symptoms. Further genetic testing may be needed for diagnosis.