Why You Need a G6PD Test Before a High-Dose Vitamin C IV
Updated October 20, 2026 · 2 min read
Before your first High-C IV, we'll ask for a blood test called a G6PD screening. If you've never heard of it, you're not alone.
Here's what G6PD is, why it matters and what to expect.
New to High-C? Start with What Is a High-Dose Vitamin C IV?
What Is G6PD?
G6PD stands for glucose-6-phosphate dehydrogenase. It's an enzyme that helps protect your red blood cells from oxidative damage.
What Is G6PD Deficiency?
G6PD deficiency is an inherited condition in which the body doesn't make enough of this enzyme. It's one of the most common enzyme deficiencies worldwide.
Many people with G6PD deficiency have no symptoms and don't know they have it until they're exposed to certain triggers, which can include specific medications, certain foods and high doses of IV vitamin C.
Why It Matters for High-Dose Vitamin C
At high doses, IV vitamin C can create oxidative stress in red blood cells. In people with G6PD deficiency, red blood cells can't protect themselves well and may break down. This is called hemolysis, and it can be serious.
That's why responsible clinics require a G6PD test before high-dose vitamin C infusions.
What to Expect
- A simple blood draw
- Lab processing, so plan ahead
- Results review with our team
- Your first High-C IV once you're cleared
Tip: Schedule your G6PD test ahead of time so you're ready when you want your first infusion, especially before cold and flu season.
What If I'm G6PD Deficient?
If your test shows a deficiency, high-dose vitamin C IVs aren't safe for you. But you still have options. Our team may recommend:
- A standard IV infusion appropriate for you
- IM vitamin shots
- Other wellness services that fit your goals
We'll also recommend you share your results with your doctor, since G6PD deficiency can affect other medications.
Other Safety Checks
Besides G6PD, our medical team also asks about:
- Kidney stones or kidney disease
- Iron overload conditions
- Pregnancy or breastfeeding
- Current medications
Safety Is Part of the Service
At iCRYO Daniel Island, screening isn't a hurdle. It's how we make sure your treatment is safe. Learn about the benefits you're working toward in High-Dose Vitamin C IV Benefits.
Ready to get screened?
High-Dose Vitamin C IV in Charleston, SC
iCRYO Daniel Island is at 866 Island Park Dr Unit 101c, Charleston, SC 29492, on Island Park Drive on Daniel Island with free on-site parking. We welcome clients from Mount Pleasant, downtown Charleston, North Charleston, Cainhoy, Hanahan and Goose Creek.
Questions? Call (843) 972-8547.
High-Dose Vitamin C IV FAQs
What is G6PD?
G6PD (glucose-6-phosphate dehydrogenase) is an enzyme that helps protect red blood cells from oxidative damage.
Why does G6PD matter for vitamin C IVs?
In people with G6PD deficiency, high-dose IV vitamin C can trigger hemolysis, the breakdown of red blood cells, which can be serious.
How is the G6PD test done?
It's a simple blood test. Our team will explain the process and timing.
Do I need a G6PD test every time?
Typically, a G6PD test is done once before your first high-dose infusion. Our team will let you know.
iCRYO Daniel Island Team
The iCRYO Daniel Island team helps clients across the Charleston area look and feel their best.
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