Neurokinin A

Alphabetical Test listing

Neurokinin A-994

Neurokinin A
Substance K

Neurokinin A is a ten amino acid putative transmitter synthesized in the neurons it is present in.  Neurokinin A is a member of the family called Tachykinins which also include Neurokinin B, Substance P, Physalaemin, and Eledoisin.   Neurokinin A shares 6 of 10 peptide homologies with Neurokinin B even though they are produced by different genes.   Neurokinin A is also very similar in structure to Substance P and produces some of the same biological actions as Substance P.  Neurokinin A is a potent bronchoconstrictor.  In the gut, Neurokinin A is produced by the intrinsic enteric nervous system.

  • Patient should not be on any medications that affect hypertension, gastrointestinal functions, or pain relievers, if possible, for at least 48 hours prior to specimen collection.

2.0 mL
1.0 mL
  1. Spin
  2. Transfer 2.0 mL plasma to a  Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp) within two (2 hours of sample collection
  3. Freeze

Frozen (strict) - 30 days

Refrigerated - NO

Ambient - NO

  • Specimen not collected in Z preservative tube.
Inter Science Institute via LabCorp (847447): R-NX
Varies; Mo - Fr
20 days

Direct Radioimmunoassay (RIA)


< 40 pg/mL