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Is a low LDH (115 IU/L) related to glucose metabolism even if fasting glucose and HbA1c are in optimal ranges?

Lactate dehydrogenase (LDH) is involved in energy production and is found in almost all cells with the highest levels in muscles, heart, lungs, liver, kidney, and blood cells.

A total LDH of 115 is at the low end of standard and below the optimal range. However, if glucose regulation markers are within optimal range and there are no symptoms of hypoglycemia, levels and symptoms can be monitored over time for changes.

To explore further, exposure to pesticides may inhibit and reduce LDH, especially in the absence of adequate personal protective equipment.

Hernández, Antonio F et al. “Influence of exposure to pesticides on serum components and enzyme activities of cytotoxicity among intensive agriculture farmers.” Environmental research vol. 102,1 (2006): 70-6.  

Large doses of ascorbic acid may decrease LDH levels as well.

Pagana, Kathleen Deska; Pagana, Timothy J.; Pagana, Theresa N. Mosby's Diagnostic and Laboratory Test Reference. Elsevier Health Sciences. 2019.

On the other hand, if LDH levels are elevated, especially above standard range, it may reflect muscle damage (including cardiac muscle), organ damage (e.g., liver, kidney, pancreas), infection, anemia, or possibly tumor activity. Further testing of LDH isoenzymes can help pinpoint where tissue damage is located.

Comprehensive Guide: Understanding Your Patient's Blood Biomarkers