3ef7af33__resistance_tests___HIV_i_Base__Comment
[Stage] Changing treatment (viral failure) [Recommendation] Yes. If viral load rebounds on treatment, test for resistance BEFORE CHANGING treatment. Resistance testing can help determine if treatment failure is due to HIV reinfection. [Comment] 
A resistance test BEFORE CHANGING treatment will provide an indication of how much resistance developed while the treatment was failing. Some low level resistance may not be detected.
Resistance 5: When to use resistance tests | HIV i-Base
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