LDH (Lactate Dehydrogenase)

Blood

Liver Function

LDH (lactate dehydrogenase) is an enzyme present in nearly every tissue in the body, released into the blood when cells are damaged or turning over rapidly. A preventive practice tracks LDH as a general, non-specific signal of cellular injury or increased tissue activity.

What It Measures

Enzyme found in many tissues; marker of cell damage and turnover

Optimal vs. Lab Range

Longevity Optimal

140–200 U/L

Target range for optimal health and longevity based on research.

Standard Lab

140–280 U/L

Population-based reference range from standard labs.

Why It Matters

LDH is a broad marker rather than a targeted one, which shapes how it is used clinically. Because it is found so widely, an elevation can arise from damage to the heart, liver, or muscle, from hemolysis, from certain cancers, or from a pulmonary embolism, so the value points to activity somewhere in the body without naming the location. A low LDH is rarely significant. Its lack of specificity means LDH is most useful as a flag that prompts further investigation and as one piece of a larger picture, interpreted alongside markers like AST, haptoglobin, and bilirubin to narrow down the source.

When Low

Rarely significant when low

When High

Tissue damage (heart, liver, muscle), hemolysis, cancer, pulmonary embolism

How to Optimize

LDH is not a value to improve on its own; a meaningful elevation is a signal to identify and address the source of cellular damage or turnover behind it. That investigation is physician-directed and guided by the clinical context, since the possible causes range widely across organ systems. Once the underlying process is found and treated, LDH typically settles. Related markers such as AST, CK, haptoglobin, and bilirubin help pinpoint where the elevation is coming from. Targets and treatment are individualized with your physician; this content is educational and not a substitute for medical advice.

Key Interventions & Linked Compounds

Moderate evidence

Key Interventions

Investigate source of tissue damage

Linked Compounds & Supplements

CoQ10

NAC

Curated from clinical literature. Individual results vary; consult a qualified clinician before changing a protocol.

Ordering Notes

Specimen

Serum or plasma (venous draw)

Patient prep

No fasting required. Maintain usual diet and medications unless advised.

Recommended cadence

Annual

Reporting unit

Confirm with the performing lab — units vary by region.

Pre-analytic notes

Standardize draw time of day, hydration, and recent exercise. Note any acute illness, supplements, or hormonal therapies on the requisition.

Recommended Follow-Up Actions

1
Confirm the result is reliable
Repeat abnormal values before acting — preferably from the same lab, same time of day, and under consistent prep. Rule out acute illness, recent intense exercise, or medication effects that can shift LDH (Lactate Dehydrogenase).
2
Compare against optimal, not just lab range
Use the optimal window above as the target. Lab "normal" is built from the general population and often misses early dysfunction.
3
Pair with related markers
Order a complementary panel covering metabolic, inflammatory, and hormonal context to interpret this marker properly.
4
Discuss interventions with a clinician
Use the interpretation guidance above to frame the conversation. Bring trends, not just one datapoint, to your visit.
5
Re-test on a defined cadence
If a change is implemented, re-measure in 8–12 weeks for fast-moving markers, or 3–6 months for slower ones, to confirm response before escalating.