Davis's Lab & Diagnostic Tests

Lactate Dehydrogenase and Isoenzymes

Lactate Dehydrogenase and Isoenzymes is a topic covered in the Davis's Lab & Diagnostic Tests.

To view the entire topic, please or purchase a subscription.

Davis’s Laboratory and Diagnostic Tests Online, powered by Unbound Medicine, provides nurses and students access to 400+ test monographs containing reference ranges, indications, patient preparation and result interpretation. Explore these free sample topics:


-- The first section of this topic is shown below --


LDH and isos, LD, and isos.

Common Use:
To assess myocardial or skeletal muscle damage toward diagnosing disorders such as myocardial infarction or damage to brain, liver, kidneys, and skeletal muscle.

Serum collected in a gold-, red-, or red/gray-top tube.

Normal Findings:
(Method: Enzymatic [L to P] for lactate dehydrogenase, electrophoretic analysis for isoenzymes) Reference ranges are method dependent and may vary among laboratories.

Lactate Dehydrogenase
AgeConventional & SI Units
0–2 yr125–275 units/L
2–3 yr166–232 units/L
4–6 yr104–206 units/L
7–12 yr90–203 units/L
13–14 yr90–199 units/L
15–43 yr90–156 units/L
Greater than 43 yr90–176 units/L
LDH Fraction% of TotalFraction of Total

-- To view the remaining sections of this topic, please or purchase a subscription --