Final answer:
A timed specimen is used in biology to measure the body's metabolism of a substance and monitor anticoagulant therapy.
Step-by-step explanation:
A timed specimen is used in biology to measure how the body's metabolism of a substance is occurring. It can be used to monitor anticoagulant therapy by measuring the rate at which the substance is metabolized. This information can help determine if the therapy is effective or if any adjustments need to be made.