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Gamma Interferon (Quantiferon)

General information

This test measures gamma interferon produced by T cells in response to mycobacterial peptides

Specimen transport: Samples should reach the laboratory within four hours of being drawn. The test is not performed on Fridays. An alternative for hospitals outside Greater Manchester is to incubate the samples locally, centrifuge them and send the supernatant. This should only be done after discussion with laboratory staff.

Repeat frequency: At significant change of clinical symptoms.

Special precautions: Three special sample tubes are required for this test. They can be obtained from Immunology. These tubes are vacutainer and will draw 1ml of blood. Please do not take the caps off the tubes. Please do not overfill the tubes. Read and follow the accompanying instructions carefully.

Laboratory information

Normal reference range: Neg

Volume and sample type: The test requires special sample tubes obtainable from Immunology (0161 276 6440)

Method: ELISA

Turnaround time (calendar days from sample receipt to authorised result): Median - 7, 95th percentile - 11

Clinical information

Indications for the test: The test is used to help diagnose latent TB infection and is indicated in individuals with a positive delayed hypersensitivity skin test.

Factors affecting the test: The test is less reliable on patients with suspected active TB (as opposed to latent TB), infants and in immune deficiency states.

 

Clinical workstation reference: GIFN

 

(Last updated October 7th 2014)