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Table 3 Acceptability of blood-based TB test at a homeless clinic and a refugee-screening clinic, San Francisco, May-December 2004. *Patients less than 18 years old, HIV-infected, immunocompromised, or pregnant were ineligible for IGRA. **Seen at SFDPH TB clinic for medical evaluation and chest radiograph within 30 days of IGRA date.

From: Feasibility, acceptability, and cost of tuberculosis testing by whole-blood interferon-gamma assay

  Homeless Clinic n (%) Refugee Clinic n (%) Total N (%)
Tested by TST or IGRA 406 145 551
IGRA Ineligible* 31 (8) 17 (12) 48 (9)
IGRA eligible 375 (100) 128 (100) 503 (100)
   IGRA performed 312 (83) 113 (88) 425 (84)
   After lab time cut-off 0 (0) 5 (4) 5 (1)
   Phlebotomy refused 30 (8) 3 (2) 33 (7)
   Phlebotomy failed 33 (9) 7 (5) 40 (8)
TST attempted 94 (100) 32 (100) 126 (100)
   Returned for reading 68 (72) 32 (100) 100 (79)
Positive IGRA results 53 (100) 50 (100) 103 (100)
   Successfully evaluated** 42 (79) 34 (68) 76 (74)