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Test ID: FNEA    
Neurokinin A (Substance K)

Specimen Type Describes the specimen type needed for testing

GI Plasma

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.

Collect blood in special tube containing G.I. Preservative (MML supply number T669). Spin down and send 5 mL of EDTA plasma frozen in a plastic vial.


NOTE:  Patient should be fasting 10-12 hours prior to collection of specimen. Antacid medication or medications that may affect intestinal motility should be discontinued, if possible, for at least 48 hours prior to collection.

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.

3 mL

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




Warm < 24 hours OK; Cold OK






EDTA with special GI preservative (MML supply T669) is required

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
GI PlasmaFrozen (preferred)28 days
 Refrigerated 7 days