Consider this scenario While testing a patient sample, the technologist discovers a labeling discrepancy between the sample and the paper request.

The two antecedents for the event (in chronological order) are:

1. the phlebotomist had mislabeled the sample, and
2. the clerk receiving the samples in the laboratory did not notice the discrepancy in the review process.

Although the initial antecedent was the action of the phlebotomist, the consequent event was the labeling discrepancy, which was discovered during sample testing.