G6PD Test

The G6PD test, also known as the glucose-6-phosphate dehydrogenase test, is a medical laboratory test used to diagnose a deficiency of the enzyme glucose-6-phosphate dehydrogenase (G6PD) in red blood cells.

What is G6PD?

G6PD is an enzyme that helps protect red blood cells from damage caused by oxidation. It is found in all cells of the body, but it is particularly important in red blood cells, which are responsible for carrying oxygen to tissues throughout the body.

Why is the G6PD test performed?

The G6PD test is typically performed to:

• Diagnose G6PD deficiency, a genetic disorder that affects the production of the G6PD enzyme
• Identify individuals who are at risk of developing hemolytic anemia, a condition in which red blood cells are destroyed faster than they can be made
• Monitor individuals who have been exposed to certain medications or substances that can trigger hemolysis (red blood cell destruction) in people with G6PD deficiency

How is the G6PD test performed?

The G6PD test typically involves a blood sample, which is sent to a laboratory for analysis. The test measures the level of G6PD enzyme activity in red blood cells.

Types of G6PD tests

There are several types of G6PD tests, including:

• Quantitative G6PD test: This test measures the amount of G6PD enzyme activity in red blood cells
• Qualitative G6PD test: This test detects the presence or absence of G6PD enzyme activity in red blood cells
• Molecular G6PD test: This test analyzes the genes that code for the G6PD enzyme to identify mutations associated with G6PD deficiency

Interpretation of results

The results of the G6PD test are typically reported as:

• Normal: G6PD enzyme activity is within the normal range
• Deficient: G6PD enzyme activity is below the normal range, indicating G6PD deficiency
• Intermediate: G6PD enzyme activity is between the normal and deficient ranges, which may indicate a mild deficiency or a variant of the G6PD gene

Clinical significance

G6PD deficiency is a common genetic disorder that affects millions of people worldwide. It can cause hemolytic anemia, jaundice, and other complications, particularly in response to certain medications or substances. The G6PD test is an important tool for diagnosing and managing G6PD deficiency.