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When measuring methamphetamine residues, the unit of measurement is µg (micrograms).  But what exactly does this mean?

A microgram is a millionth of a gram, and when measuring things in micrograms the term ‘parts per million’ is also sometimes used.  However, it’s also worth noting that laboratories are typically measuring methamphetamine residues at a level as low as 0.02 µg, which is actually 20 nanograms (or 20 parts per billion).

So what are some useful analogies to use for these low levels of measurement?

1 part per million or 1 microgram

  • One second in 10 days or a minute in 2 years.
  • A large cup of coffee emptied into an Olympic sized swimming pool (50 m long by 25 m wide and 2 m deep).
  • 3 grains of rice in 100 kilograms of sugar.

1 part per billion or 1 nanogram

  • 1 car in a line of cars that goes around the earth 100 times.
  • 3 seconds in a century.
  • A 10 cent coin compared with 100 million dollars.

In other words, the residues of methamphetamine that can safely be in a property are very low! The equipment used for this testing by laboratories is very sensitive, and Analytica Laboratories has literally millions of dollars worth of sophisticated LC-MS/MS analysers for the task.

Source: Analytica Laboratories