An Older Adult Client Is Experiencing Symptoms Commonly Associated with Hyperglycemia

An older adult client is experiencing symptoms commonly associated with hyperglycemia (diabetes mellitus) .Which laboratory test is most reliable for detecting hyperglycemia in older adults?

A) A serum glucose drawn after at least 6 hours of fasting
B) An oral glucose tolerance test
C) An early morning urine test for glucose
D) A 24-hour urine glucose test