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Test ID: FEND1    
Endothelin I

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.

Submit only one of the following:



Draw blood in a plain, red-top or serum-gel tube(s). Separate immediately and send 3 mL of serum frozen in a plastic vial.



Draw blood in a lavender-top (EDTA) tube(s). Separate immediately and send 3 mL of plasma frozen in a plastic vial.


Patient Preparation:

Patient should NOT be on any ACTH, Corticosteroids, or hypertension medications, if possible, for at least 48 hours prior to collection of specimen.

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.

1 mL

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




Warm reject; Cold 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
VariesFrozen (preferred)180 days
 Refrigerated 7 days