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Lactate across conditions

Lactate appears in 3 entries of the OSMF biomarker atlas, covering Gulf War Illness, Long COVID, ME/CFS. Across those entries it is elevated in 3. Because the same marker shifts in several unrelated conditions, it is best understood as a signal of shared biology such as inflammation, vascular or metabolic stress rather than as a condition-specific test. Each row below links to a page with the comparison group, associated symptoms, test details and primary citation.

Gulf War IllnessLong COVIDME/CFS

Where Lactate is reported

Also listed as: Anaerobic metabolite; Lactate (blood)

ConditionDirectionCompared againstAssociated symptomsSource
Gulf War Illness↑ elevatedhealthy Gulf War veteran controlsExercise intoleranceGean et al. 2021
Long COVID↑ elevatedhealthy controlsExercise intolerance, PEMBaalbaki et al. 2025
ME/CFS↑ elevatedhealthy controlsExercise intolerance, PEMHolden et al. 2020

Frequently asked questions

In which conditions is Lactate altered?

In the OSMF atlas Lactate is reported in Gulf War Illness, Long COVID, ME/CFS. It is elevated in 3 across 3 entries.

Does Lactate point to one specific diagnosis?

No. Because Lactate changes in several conditions (Gulf War Illness, Long COVID, ME/CFS), an abnormal result cannot identify which condition, if any, is present. It must be interpreted with symptoms, history and other tests.

What is the LOINC code for Lactate?

Entries in this atlas use LOINC 2524-7. LOINC codes identify the laboratory observation so results can be compared across systems.

Is one abnormal Lactate result diagnostic?

No single biomarker result is diagnostic of any of these conditions. Findings reflect group averages from published cohorts with substantial overlap between patients and controls.

Cite this page

Open Source Medicine Foundation. (2026). Lactate across conditions: biomarker evidence. OSMF Research Tracker. Retrieved October 7, 2026, from https://research.opensourcemed.info/biomarkers/markers/lactate.html
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Last reviewed: 2026-06-29 · Browse: Biomarker Index · All marker pages · Biomarker Atlas

Disclaimer: Educational synthesis of peer-reviewed research; not medical advice. Findings are group-level and vary with study design. Discuss any result with a qualified clinician.