Video about how blood tests are taken. Please note that this video is from the United Kingdom; the process for taking a blood test may differ slightly from how it is done in New Zealand.
"A blood test involves drawing blood, usually via a hypodermic needle inserted into a vein in the arm, and sending the sample for testing. Taking a blood sample is usually painless and over in a matter of seconds."
(Nuffield Health, UK, 2015)