Lab services are not currently available. We're working to bring Feelrx Labs online soon — everything below is a preview of what's coming.
Quest / Blood & Iron Markers
Lactate Dehydrogenase (LD)
**Lactate Dehydrogenase (LD or LDH)** is an enzyme found in many tissues throughout the body, including the heart, liver, kidneys, muscles, brain, and blood cells. It plays a key role in energy production by converting lactate to pyruvate. **Why it matters:** LD is released into the bloodstream when cells are damaged or destroyed. Elevated LD levels may indicate: * Tissue injury or inflammation * Liver disease * Hemolysis (red blood cell breakdown) * Certain cancers or infections * Heart attack or muscle damage **Low LD** levels are typically not concerning and are rarely clinically significant.
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What this lab measures
**Lactate Dehydrogenase (LD or LDH)** is an enzyme found in many tissues throughout the body, including the heart, liver, kidneys, muscles, brain, and blood cells. It plays a key role in energy production by converting lactate to pyruvate. **Why it matters:** LD is released into the bloodstream when cells are damaged or destroyed. Elevated LD levels may indicate: * Tissue injury or inflammation * Liver disease * Hemolysis (red blood cell breakdown) * Certain cancers or infections * Heart attack or muscle damage **Low LD** levels are typically not concerning and are rarely clinically significant.
How testing works
Order online
Choose your marker and add a brief medical history so your result has context from the first draw.
Visit a partner lab
Take your order to a certified Quest location for a short blood draw.
Clinician review
A licensed clinician reviews your result and shares clear interpretation with next steps.
FAQ
After ordering, visit a certified Quest partner location for a short blood draw. No insurance is required.
Feelrx / Start here
Know your baseline.
Order a panel online, draw at a certified partner lab, and receive a clear clinician review.
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