Special preparation is not expected of you for most of the tests you are likely to undergo. However, in the event that you are required to fulfil certain pre-test obligations, your healthcare professional will inform you of the specific requirements. For instance, if you need to fast prior to a test, you will be told specifically what to abstain and for how long.
Correct collection of specimen ensures that your results can be provided quickly and accurately. For certain blood tests, you may be required to fast for 8 to 12 hours. Generally, you should continue taking your medication, unless your doctor has advised you otherwise.