Final answer:
Values of 20 and 30 seconds for prothrombin time are outside the normal range, which is generally 11 to 13.5 seconds, while a value of 12 seconds falls within the normal range.
Step-by-step explanation:
The prothrombin time (PT) is a blood test that measures the time it takes for the liquid portion of your blood (plasma) to form a clot. The PT is often used to check for bleeding problems or to monitor how well blood-thinning drugs (anticoagulants) are working. Generally, the normal range for prothrombin time can vary slightly between different laboratories but is usually around 11 to 13.5 seconds. A value of 20 seconds and 30 seconds would be considered outside of the normal range and may indicate a coagulation disorder, vitamin K deficiency, liver disease, or the effect of anticoagulant therapy such as warfarin. In contrast, a value of 12 seconds falls within the general normal range.