For most tests, special preparation is normally not required.
Your healthcare professional will inform you of the specific requirements if any. For example, if you need to fast prior to a test, you will be told specifically what to abstain from 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.