Multiple Choice
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.
Correct Answer:

Verified
Correct Answer:
Verified
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