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Order Code ALDEF Alpha Defensin, Lateral Flow Assay, Synovial Fluid


Ordering Guidance


This test should only be used for patients with a total joint prosthesis.



Necessary Information


Specimen source and type of joint are required. If not obtained from a prosthetic joint, testing will be canceled.

 

If ordering electronically, answers must be provided for the order entry questions.

 

If not ordering electronically, specimen source and type of joint must be provided on the request form.



Specimen Required


Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Collection Container/Tube: Plain red-top tube

Submission Container/Tube: Plastic vial

Specimen Volume: 0.6 mL


Useful For

Detection of alpha defensins 1-3, human host response proteins, in synovial fluid of adults with a total joint replacement who are being evaluated for revision surgery

 

This test is not intended to be used to determine timing for reimplantation in 2-stage procedures.

Method Name

Lateral Flow Assay (LFA)

Reporting Name

Alpha Defensin, Synovial Fluid, LFA

Specimen Type

Synovial Fluid

Specimen Minimum Volume

0.10 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Synovial Fluid Refrigerated 7 days

Reject Due To

Gross hemolysis Reject

Reference Values

Negative

Reference values apply to all ages.

Method Description

The Alpha Defensin Lateral Flow Test Kit is an immunoassay test system comprised of a single use device, a premeasured vial of dilution buffer, a disposable Microsafe tube, and a sample cup.

 

Each device contains a reagent strip with all the critical components for the assay. Dilution is performed by collecting a sample from an aspirated synovial fluid specimen using the disposable Microsafe tube and adding the sample to the premeasured dilution buffer. Three full, free-falling drops of the diluted sample are then added to the test device to begin the testing process. Cellular material is removed by the first pad. The solution then migrates to the buffering pad and mixes with the gold conjugate that has been labelled with an anti-alpha defensin antibody. The test mixture then migrates across the test line and the control line. A test result line will form if the level of alpha defensin in the sample is greater than the cut-off concentration. A control line will form to confirm that the solution has properly flowed across the device. Results can be read between 10 to 20 minutes.(Package insert: Synovasure Alpha Defensin Lateral Flow Test Kit. Zimmer Biomet; M40004 V 8, 01/2024)

Day(s) Performed

Monday through Friday, Sunday

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

83518