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Test Code BLOD1145 Quantiferon

Important Note

This Quantiferon Gold Plus test utilizes an indirect ELISA test method for Mycobacterium tuberculosis infection.  Testing is to be used in conjunction with risk assessment, radiography, and other medical and diagnostic evaluations.

AKA

TB

IGRA

Interferon Gamma Release Assay

Bozeman Health Laboratory Services Note:

AKA Quantiferon Gold Plus

Stability

AFTER INCUBATION AND CENTRIFUGATION

Room Temperature: 3 days
Refrigerated: 28 days
Frozen: NA

Interfering Substances

Hemolysis: No
Lipemia: No

Transport Temperature

Refrigerated for Incubated specimens.

 

Room temperature if sample has NOT been incubated and will arrive at performing lab within 16 hours of collection.

Instructions

Tubes must be filled appropriately to Black line designated on each of the 4 tubes contained in the kit.

(Tubes may fill slowly)

It is recommended to draw a waste tube to ensure the needle is secured in the vein.

Tubes should be between 17 - 25° C (Room Temperature) at the time of blood filling.

 

Draw order of tubes is:

1. Nil control (grey)

2. TB1-Antigen (green)

3. TB2-Antigen (yellow)

4. Mitogen Control (purple)

 

Hold tube on needle for 2 - 3 seconds after flow ceases.

Butterfly needles - prime the tubing with a normal tube BEFORE filling the 4 QFT tubes.


Immediately after filling, SHAKE the tubes 10 times firmly enough to ensure the inner surface of each tube is coated in blood. (to solubilize antigens on the tube walls) This may be accomplished by holding the tubes upright in hand and using a sweeping up and down motion bending from arm to elbow (not from the wrist).

 

NOTE: Over-energetic shaking may cause gel disruption and could lead to aberrant results.

 

PROCESSING/STABILITY INSTRUCTIONS:


Option 1  NOT INCUBATED

Within 16 hrs of collection -  Send tubes unspun at room temp to arrive at the performing lab

within 16 hrs of collection.
Tubes should be clearly labeled NOT INCUBATED.
Stability:  Not incubated/unspun – Room Temp 16 hrs

 

Option 2 INCUBATE AT TESTING LABORATORY

Within 16 hrs of collection – Incubate tubes in upright position in a 37 Degree incubator at the
collection site for 16 – 24 hrs.
Spin down samples so gel barrier rises to separate cells and plasma.

Do not aliquot specimens from tubes. Send in original tubes.

Cleary label tube: INCUBATED
Stability: Incubated/spun – Room temp:  3 days   Refrig: (preferred) 28 days

 

 

Performed Test Frequency

Monday through Sunday

Methodology

In-Tube Method

CPT

86480

Performing Lab

Sanford Sioux Falls

Additional Information

The performance of QuantiFERON-TB Gold has not been evaluated in specimens from the following:
· Individuals with impaired or altered immune functions
· Individuals younger than 17 years old
· Pregnant Women