Final answer:
The recommended screening test for rodenticide ingestion is the c) Prothrombin Time (PT), which evaluates the extrinsic and common coagulation pathways affected by vitamin K antagonists typically found in rodenticides.
Step-by-step explanation:
The screening test recommended for ingestion of rodenticides, which are known to affect blood coagulation, is c) Prothrombin Time (PT).
PT is a measure of the extrinsic and common coagulation pathways, and rodenticides commonly contain anticoagulants like warfarin that interfere with vitamin K-dependent clotting factors, which are assessed by the PT.
To confirm rodenticide ingestion, a prolonged PT would indicate an impairment in the clotting process, which is consistent with vitamin K antagonist ingestion.