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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)