Allina Health Laboratory a part of Abbott Northwestern Hospital



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Test Name:Parathyroid hormone, fine-needle aspiration biopsy (FNAB) - needle wash
Test Number:994
Collect:1.5 mL fine needle wash
Container:Plain, plastic, screw-top tube
Processing:See Collection / Processing details
Alternate Names:FNA
Needle Wash
Performing Lab:Mayo Clinic Laboratories (PTHFN); R
Days Set Up:Mo - Sa
Expected TAT:1-3 days
Ref. Ranges:See report
Processing Details:
Useful for: An adjunct to cytology examination of fine-needle aspiration specimens to confirm or exclude presence of parathyroid tissue in the biopsied area

Collection Instructions:
  1. Needle wash specimens for analysis should be collected in conjunction with cytology specimens.
  2. Have saline available prior to start of procedure. Saline is the only acceptable solution for needle washings.
  3. After each fine-needle aspiration biopsy (FNAB) has been collected and the material in the needle has been expelled onto a slide for cytologic analysis, attach the used FNAB needle to an empty syringe.
  4. Withdraw between 0.10 mL and 0.25 mL of saline up through the needle until the saline starts to fill the hub of the needle or end of the syringe.
  5. Expel this fluid back through the needle into a separate plastic aliquot tube. This is the needle washing used for analysis.
  6. Repeat steps 2 through 4 for each needle pass of the same biopsied site and empty into the same tube, accumulating a total of 0.5 mL to 1.5 mL of fluid to send to the laboratory. (If more than 1 site is biopsied, see Additional Information).
  7. Inspect specimen for visible blood or tissue contamination:
    1. If bloody, centrifuge specimen and transfer supernatant to a new plastic aliquot tube (5-mL standard tube) to send to laboratory. The supernatant, not the cellular material, is used for analysis.
    2. If specimen is clear, centrifugation is not necessary.
  8. Refrigerate within 1 to 2 hours of collection and freeze within 2 to 4 hours of collection.
Method:Electrochemiluminescence Immunoassay
CPT Codes:83970
Date Created:11/01/2017
Revised Date:10/16/2018