Comment by ctoa
7 hours ago
The bigger worry isn't really false negatives, modern PCR based testing is incredibly good. There is always risk but it's frankly extremely low. The bigger issue is that blood is pooled before testing to make that powerful testing economical. If you increase the rate at which you get (also possibly false) positives you risk having to throw out whole batches of pooled donations.
The false negative rate for HIV testing in newly infected people is actually pretty high, like 50% within the first few months high.