Low level relates to greater incidence of infections and slow recovery. Low globulin indicates less antibodies being produced, a good sign of not having immune hyperactivation which is common in HIV infected. If you have these in the normal range you could be considered safe even though you may have a high VL compared to someone with low VL and with these out of the range. First, your VL must be tested in the same lab with the same equipment. You cannot compare the numbers of Roche with Chiron machine.
Some labs conduct both types.
Secondly, we do not share the sentiments of accepting a 3 fold change. Well, we cannot agree that having 299,000 copies is as good as having 100,000 copies and is insignificant. Thirdly, yes there are cases of HIV VL found in uninfected persons . Fourthly, the reproducibility of the test is greatly varied. That means with the same blood sample you can get varied results even with the same lab.