LabInformationLab tests, explained

Glucose 6-Phosphate Dehydrogenase (G6PD) Test in California

This page explains the glucose 6-phosphate dehydrogenase (g6pd) test, what it measures, and how to arrange it. The Glucose 6-Phosphate Dehydrogenase (G6PD) test measures the amount of an enzyme called G6PD in red blood cells. This enzyme helps protect red blood cells from damage. The test is ordered to check for G6PD deficiency, a condition that can cause red blood cells to break down too early (hemolysis) when exposed to certain triggers. This page covers the glucose 6-phosphate dehydrogenase (g6pd) test for people in California, in Pacific, from what it measures to how to arrange a draw.

Sample type
blood
Category
Metabolic & Glucose
Turnaround
1-3 business days
Price
$158
Referral
Not required

The Glucose 6-Phosphate Dehydrogenase (G6PD) test measures the amount of an enzyme called G6PD in red blood cells. This enzyme helps protect red blood cells from damage. The test is ordered to check for G6PD deficiency, a condition that can cause red blood cells to break down too early (hemolysis) when exposed to certain triggers.

What it measures

  • G6PD enzyme activity — The main measurement. It shows how well the enzyme is working in your red blood cells.
  • Hemoglobin — The protein in red blood cells that carries oxygen. Low levels can be a sign of anemia.
  • Reticulocyte count — The number of young red blood cells. A high count may mean your body is making more red blood cells to replace those being destroyed.
  • Bilirubin — A yellow substance made when red blood cells break down. High levels can cause jaundice (yellowing of the skin and eyes).

Who it is for

A healthcare provider may order this test if you have symptoms of hemolysis, such as jaundice, dark urine, or fatigue, especially after taking certain medications or eating fava beans. It is also used to screen people before starting drugs that can trigger hemolysis, or if you have a family history of G6PD deficiency.

Preparation

No special preparation is needed for this test. You do not need to fast. Tell your provider about any medications or supplements you take, as some can affect the results.

Results and what they mean

Results are usually reported as a number that shows your G6PD enzyme activity level. A low level suggests G6PD deficiency, but your clinician will interpret the result along with your symptoms and other tests. This information is not medical advice; only a qualified healthcare provider can diagnose a condition and recommend treatment.

Requesting the Glucose 6-Phosphate Dehydrogenase (G6PD) Test in California

Order online, choose a certified collection site in California, and review results through a secure portal. No referral is required, and orders are processed confidentially. With coastal metros, inland towns, and rural counties with very different access to testing, it pays to schedule your collection in advance.

Frequently asked questions

Do I need to fast for this test?

No, fasting is not required. You can eat and drink normally before the test.

What does a low G6PD result mean?

A low result may indicate G6PD deficiency, which means your red blood cells are more easily damaged. Your provider will discuss what this means for you.

Can I have this test if I already had a blood transfusion?

A recent blood transfusion can affect the results. Tell your provider if you have had a transfusion recently, as you may need to wait before testing.

Is G6PD deficiency serious?

Most people with G6PD deficiency live normal lives by avoiding certain triggers, such as specific medications, fava beans, and infections. Your provider can give you personalized guidance.

Glucose 6-Phosphate Dehydrogenase (G6PD) Test by city in California

All testing in California →   Full Glucose 6-Phosphate Dehydrogenase (G6PD) Test guide →