Glossary

undetectable – an amount smaller than a test can measure. For viral load tests, this means below 400 or, more commonly, below 50 copies/mL, depending on the make of test. In research laboratories, some very sensitive tests can measure down to 1 copy/mL.

TD (or tid) – a short hand term for medication dosing that means ‘take three times a day’.

See also q8H.

substitution therapy – using a prescription drug, eg methadone or buprenorphine, to stop using heroin.

median (average) – where the results are all arranged in numerical order and the middle of the range is taken as the (median) average. See mean.

What is an average.

sanctuary site – see compartment site.