TB test in HIV

Q: Below which CD4 count tuberculin skin test stays negative in HIV patients?


Answer: 300 cells/microL

Tuberculin skin test is still a useful test in HIV patients with positive read at >5 mm. Tuberculin test depends upon the CD4 count so the test become meaningless below 300 cells/microL.

#infectious-diseases


Reference:

1. https://www.cdc.gov/mmwr/preview/mmwrhtml/00031075.htm