Final answer:
The typical expected value for aPTT is 30-40 seconds, with the closest choice from the given options being (a) 20-40 seconds.
Step-by-step explanation:
The expected value for activated Partial Thromboplastin Time (aPTT) is 30-40 seconds. The provided answer choices don't specify this range exactly, but choice (a) 20-40 seconds is the closest to the normal range, although it is broader than the typical expected range. The aPTT test is used to measure the efficiency of the blood's clotting pathway and is often utilized when monitoring heparin therapy. It is important for the aPTT value to be within a certain range to ensure effective treatment without excessive risk of bleeding or clotting complications.