Adults 130 - 240 UI/l
Children from 12 to 18 years old: 100 - 290 UI/l
Children from 2 to 12 years old: 120 - 345 UI/l
Children up to 2 years old: 155 - 395 UI/l
Babies from 1 month to 1 year old: 170 - 450 UI/l
Newborns (1 to 30 days old): 125 - 765 UI/l
In the International System of Units (SI), LDH in the blood is measured in µkat/L. The normal LDH level in the blood in the SI is:
Adults 2.17 - 4 µkat/l
Children from 12 to 18 years old: 1.67 - 4.84 µkat/l
Children from 2 to 12 years old: 2 - 5.76 µkat/l
Children up to 2 years old: 2.58 - 6.59 µkat/l
Babies from 1 month to 1 year old: 2.83 - 7.51 µkat/l
Newborns (1 to 30 days old): 2.08 - 12.77 µkat/l
Each laboratory must establish its own normal ranges for LDH in the blood. These ranges depend on the makeup of the local population, the technologies used and the accuracy of the measurement. There may be also slight differences in the normal levels, according to age, gender, race or ethnic origin, geographic region, diet, type of sample and other relevant status.
Your doctor will study the results along with your medical record, screenings, physical condition, symptoms and any other relevant information about your situation.
The normal ranges of LDH in the blood may be very different from lab to lab depending on the technique and the temperature at which it is measured. One of the most used methods follows the IFCC standard at 37ºC and it is the one explained in this guide. In case your test is performed at a different temperature (for example 30ºC) or with a different technique, the normal range may differ. For that reason, it is very important to check the normal range that appears in your report.
Besides, LDH may be measured in different fluids such as urine or cerebral spinal fluid (CSF). In the CSF, the normal range is approximately a 10% of the amount in the blood. An elevation of LDH in CSF is a sign of bacterial meningitis.
LDH (lactate dehydrogenase), also called lactic acid dehydrogenase or LD, is a hydrogen transfer enzyme, from the oxidoreductase family, that catalyzes the reversible conversion of lactic acid to pyruvic acid. For this reason, it plays an important role in the regulation of the body’s energy.
LDH is found in many body tissues of the body particularly heart, liver, skeletal muscle, kidney and RBCs (Red Blood Cells). It is also present in other organs such as the kidneys, pancreas, spleen, brain, and lungs.
LDH is found in the form of isoenzymes based on their electrophoretic mobility. There are five main isoenzymes being each one primarily from a different organ:
In a normal situation, LDH2 is the isoenzyme that contributes more to the total LDH.
A LDH blood test is usually used as an indicator of tissue damage. When tissues are damaged, they release LDH isoenzymes into the bloodstream depending on the location and severity of the injury.
Therefore, an increase of LDH in the blood is a pathological condition that occurs when tissues are damaged. A serum LDH increase may be related to myocardial infarction, liver diseases, pernicious anemia, megaloblastic anemia, renal diseases, malignant diseases, and progressive muscular dystrophy.
A total LDH increase is not specific for any disease and it is necessary to know the isoenzyme causing the increase to give a more appropriate diagnosis.
For example, myocardial infarctions and hemolytic anemias tend to cause elevations in LDH1 and LDH2, LDH3 is elevated in pulmonary infarction while LDH5 is usually elevated due to liver disorders. Malignant tumors, in general, cause increases in LDH2, LDH3 and LDH4.
LDH levels below the normal range are rare and give usually no medical information. However, there are some genetic disorders related to a low LDH level in the blood. A decrease in the LDH level during a cancer treatment is usually a positive sign.
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The following values are considered to be normal values:
IMPORTANT: These levels are expressed in UI/l. They are an example of a healthy man of about 45 years old with no known disease and not taking any medication. The ranges can be different depending on the laboratory or on your personal circumstances.
Lactate dehydrogenase (LDH)
|130 UI/l||132 UI/l||134 UI/l||136 UI/l||138 UI/l||140 UI/l||142 UI/l||144 UI/l|
|146 UI/l||148 UI/l||150 UI/l||152 UI/l||154 UI/l||156 UI/l||158 UI/l||160 UI/l|
|162 UI/l||164 UI/l||166 UI/l||168 UI/l||170 UI/l||172 UI/l||174 UI/l||176 UI/l|
|178 UI/l||180 UI/l||182 UI/l||184 UI/l||186 UI/l||188 UI/l||190 UI/l||192 UI/l|
|194 UI/l||196 UI/l||198 UI/l||200 UI/l||202 UI/l||204 UI/l||206 UI/l||208 UI/l|
|210 UI/l||212 UI/l||214 UI/l||216 UI/l||218 UI/l||220 UI/l||222 UI/l||224 UI/l|
|226 UI/l||228 UI/l||230 UI/l||232 UI/l||234 UI/l||236 UI/l||238 UI/l||240 UI/l|