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Test ID: NAGS    
Hexosaminidase A and Total Hexosaminidase, Serum

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Specimen Type Describes the specimen type needed for testing

Serum

Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.

Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Specimen Volume: 1 mL

Additional Information:

1. Serum assay results are not valid on pregnant females and will not be run. If carrier screening for Tay-Sachs or Sandhoff disease is desired in a pregnant female and testing was not performed prior to pregnancy, refer to NAGR / Hexosaminidase A and Total, Leukocytes/Molecular Reflex or NAGW / Hexosaminidase A and Total Hexosaminidase, Leukocytes for testing on the patient or partner.

2. The recommended test for Tay-Sachs carrier screening (regardless of gender or pregnancy status) is NAGR / Hexosaminidase A and Total, Leukocytes/Molecular Reflex.

Forms: New York Clients-Informed consent is required. Please document on the request form or electronic order that a copy is on file. An Informed Consent for Genetic Testing (Supply T576) is available in Special Instructions.

Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.

0.5 mL

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected

Hemolysis

Mild OK; Gross OK

Lipemia

Mild OK; Gross OK

Icterus

NA

Other

NA

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.

Specimen TypeTemperatureTime
SerumFrozen (preferred)30 days
 Refrigerated 7 days