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LDH is released into the blood whenever cells are stressed or damaged — essentially any tissue in the body can contribute, from red blood cells to muscle to liver to lungs. A value within the normal range means no significant tissue injury is currently being flagged. Because LDH is so non-specific, a normal reading here helps rule out a few things (significant hemolysis, major muscle breakdown, active hepatitis) but doesn't tell us much beyond "nothing major is releasing enzyme right now."
Lactate dehydrogenase (LDH) is an enzyme that sits inside basically every cell in your body, which is why it only gets released into the blood when cells are injured. A low reading is the opposite situation — very little tissue turnover happening — and on its own it's almost never clinically significant. The two situations where low LDH has been documented are chronic very high-dose vitamin C supplementation (which interferes with the assay more than the biology) and a rare inherited enzyme deficiency, neither of which warrant workup without other findings.
No action needed on a low LDH in isolation. If you're taking several grams of vitamin C daily, stepping back and re-testing will usually normalize this.
LDH: {{value}} {{unit}} — lowLDH is released into the blood whenever cells are stressed or damaged — essentially any tissue in the body can contribute, from red blood cells to muscle to liver to lungs. A value within the normal range means no significant tissue injury is currently being flagged. Because LDH is so non-specific, a normal reading here helps rule out a few things (significant hemolysis, major muscle breakdown, active hepatitis) but doesn't tell us much beyond "nothing major is releasing enzyme right now."
Nothing to act on. LDH on its own is rarely the test that drives decisions — it's usually interpreted alongside targeted markers for the tissue under suspicion.
LDH: {{value}} {{unit}} — normal (ref: {{low}}–{{high}})An elevated LDH means cells somewhere in the body are breaking down and spilling their contents faster than usual — but LDH by itself doesn't tell you which cells. The usual suspects, in rough order of frequency: red blood cells breaking down (hemolysis), muscle injury (from exercise, trauma, or statin side effects), liver injury (hepatitis, fatty liver), lung issues (pneumonia, PE), and less commonly certain cancers or autoimmune flares. Because the signal is so non-specific, the useful question is always "LDH is up alongside what else?" — that's what pins down the source. Mild elevations after a hard workout are routine and usually resolve within a few days.
Interpret in context. Pair with a CBC + peripheral smear (to check for hemolysis), CK (muscle), AST/ALT (liver), and haptoglobin if hemolysis is suspected. Persistent unexplained elevation is worth a conversation with your doctor. A single mildly-high reading after strenuous exercise is almost always benign — re-test after a few days of rest.
LDH: {{value}} {{unit}} — elevatedUpload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.