HCYSS - Specimen: Homocysteine, Total, Serum

Test Catalog

Test ID: HCYSS    
Homocysteine, Total, Serum

Specimen Type Describes the specimen type needed for testing


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.

Patient Preparation: Fasting (12 hours, preferred but not required)

Container/Tube: Red top or serum gel tube

Specimen Volume: 0.4 mL

Collection Instructions:

1. Immediately place specimen on wet ice.

2. Spin down and separate serum from cells within 4 hours of draw. A refrigerated centrifuge is not required if 1-hour time restraint is met.

3. Alternatively, if blood is not immediately placed on ice, serum must be removed from cells within 1 hour of draw. A refrigerated centrifuge is not required if 1-hour time restraint is met.

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.

0.15 mL

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


Mild OK; Gross OK


Mild OK; Gross OK


Mild OK; Gross OK



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
SerumRefrigerated (preferred)7 days