Test Catalog

Test ID: NAGS    
Hexosaminidase A and Total Hexosaminidase, Serum

Useful For Suggests clinical disorders or settings where the test may be helpful

Recommended test for carrier detection and diagnosis of Sandhoff disease


Carrier detection and diagnosis of Tay-Sachs disease


This test is not useful for pregnant females or those treated with hormonal contraception.

Genetics Test Information Provides information that may help with selection of the correct genetic test or proper submission of the test request

This test is appropriate for carrier detection and diagnosis of both Sandhoff disease and Tay-Sachs disease in males and females who are neither pregnant nor receiving hormonal contraception. Refer to NAGR / Hexosaminidase A and Total, Leukocytes/Molecular Reflex, Whole Blood or NAGW / Hexosaminidase A and Total Hexosaminidase, Leukocytes for carrier detection and diagnosis of Tay-Sachs disease during pregnancy or treatment with hormonal contraception.

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

The following algorithms are available in Special Instructions:   

Tay-Sachs Disease Carrier Testing Protocol

Tay-Sachs and Related Disorders Diagnostic Testing Algorithm

Special Instructions Library of PDFs including pertinent information and forms related to the test

Method Name A short description of the method used to perform the test

Heat Inactivation, Fluorometric, Automated

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

Hexosaminidase A and Total, S

Aliases Lists additional common names for a test, as an aid in searching

GM2 Gangliosidosis
Hex A Deficiency
Hex B Deficiency
Hexosaminidase A Deficiency
Hexosaminidase B Deficiency
Hexosaminidase, Total
Sandhoff Carrier Screening
Sandhoff Carrier Testing
Sandhoff Disease
Sandhoff Disease Carrier Screening
Tay Sachs Disease
Tay-Sachs Disease Testing