MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Urinalysis test kit. The stick has been dipped into a patient's urine, and the patches down its length change colour in the presence of certain chemicals. Comparing the colours to the reference chart allows the detection of abnormal compounds in the urine, which can be used to diagnose diseases.
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