2 - 5 days
Test Updated:
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Test Overview
Heat Inactivation, Fluorometric, Automated
Preferred test to order for Tay-Sachs disease, carriers of Tay Sachs, Sandhoff's disease, and carriers of Sandhoff's.
HEXOSAMINIDASE TOTAL, LEUKOCYTES: <=15 yrs: >=20 nmol/min/mg, >=16 yrs: 16.4 - 36.2 nmol/min/mg; HEXOSAMINIDASE PERCENT A, LEUKOCYTES: <=15 yrs: 20 - 80% of total, >=16 yrs: 63 - 75% of total; HEXOSAMINIDASE TOTAL, SERUM: <=15 yrs: >=20 nmol/min/mL, >=16 yrs: 10.4 - 23.8 nmol/min/mL; HEXOSAMINIDASE PERCENT A, SERUM: <=15 yrs: 20 - 90% of total, >=16 yrs: 56 - 80% of total.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Specimen Requirements
MALES (serum): Collect specimen in a red top tube from a fasting patient. Centrifuge, aliquot serum into a plastic vial and freeze (do not refreeze thawed serum). FEMALES (leukocytes): Collect blood in 7 mL yellow top tube (ACD) solution A or B from a fasting patient. Refrigerate intact ACD tube (frozen ACD tube is unacceptable). ACD specimen must arrive within 48 hours of collection.
MALES (serum): Collect specimen in a red top tube from a fasting patient. Centrifuge, aliquot serum into a plastic vial and freeze (do not refreeze thawed serum). FEMALES (leukocytes): Collect blood in 7 mL yellow top tube (ACD) solution A or B from a fasting patient. Refrigerate intact ACD tube (frozen ACD tube is unacceptable). ACD specimen must arrive within 48 hours of collection.
