DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Gloved hand pipettes urine from a sample tube before placing it on a test device to detect Cotinine (a bi-product of Nicotine) to determine whether a patient has been smoking. See images 2 and 3 in which urine is placed on the test device producing a negative test.
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