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In a Direct ELISA Test to Screen for Drugs in a Patient's

Question 22

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In a direct ELISA test to screen for drugs in a patient's urine,what is the third step in the test process?


A) Substrate for the enzyme is added.
B) Enzyme-labeled antibody against the drug being tested is added.
C) The patient's urine sample is diluted.
D) Antibody against the drug being tested is added.

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