Glucose in Serum or Plasma (Quantitative)

Why Is This Test Done?

Your healthcare provider may order this test to check for high or low blood sugar levels, diagnose diabetes, monitor treatment progress, or assess conditions like hypoglycemia, hyperglycemia, or metabolic disorders. It can also be used during pregnancy to screen for gestational diabetes or before certain surgeries to ensure stable blood sugar.

When Might You Expect Results?

Results are usually available within a few hours to a couple of days, depending on the lab’s processing speed and your healthcare provider’s request. Some tests may be done immediately if urgent, such as in emergency situations.

What Does the Test Involve?

You’ll have a small needle inserted into a vein in your arm or hand to draw blood. The blood sample is then sent to a lab for analysis. If testing is done at home (e.g., for diabetes management), you’ll use a fingerstick to collect a small blood sample.

What Are Common Causes of Abnormal Results?

High glucose levels may be caused by diabetes, poor diet, stress, illness, or certain medications. Low glucose levels (hypoglycemia) can result from excessive insulin, certain medications, prolonged fasting, or liver or kidney problems. Other factors, like physical activity or hormonal changes, can also influence results.