Glucose 6-Phosphate Dehydrogenase (G6PD) Test, Quantitative in Illinois

What this test is

Glucose 6-Phosphate Dehydrogenase (G6PD) is an enzyme found in red blood cells that helps protect them from damage. A quantitative test measures the specific amount of this enzyme present.

What it measures

• Glucose 6-Phosphate Dehydrogenase (G6PD) — reflects the amount of a key enzyme in red blood cells

What the test involves

This test requires a standard blood draw from a vein in your arm. A healthcare professional will collect the sample and send it to a laboratory for analysis.

Why it is often ordered

Clinicians may order this test if they suspect a G6PD deficiency, which can cause red blood cells to break down prematurely. It is often considered when certain medications or foods trigger adverse reactions.

Preparation

Please follow any specific instructions provided by the laboratory regarding preparation for this test. General fasting is typically not required.

How results are reported

Your results will indicate the quantitative level of G6PD enzyme activity. Reference ranges, which help interpret these levels, vary between laboratories and are usually provided with your report.

Before you go

• Confirm the specific preparation instructions with the lab.
• Verify the turnaround time for results.
• Ask about the process for receiving your report.