Is LDH 340 high, normal or dangerous? What does Lactate dehydrogenase level 340 mean?

📅 Medical Review Date: April 3, 2026

Your LDH level of 340 is a High LDH level.

High LDH levels may indicate underlying health problems. The normal range is typically between 100 U/L and 190 U/L. If your levels are outside this range, it's important to speak with a healthcare provider. Consulting a doctor is recommended to determine the cause and appropriate next steps.

The normal LDH range for men is :100 - 190 U/L

Ideal values of LDH depending on age (male) :

Age	Ideal LDH value
<5 years	103.4
5-10 years	106.916
10-15 years	110.551
15-20 years	114.31
20-25 years	118.197
25-30 years	122.216
30-35 years	126.371
35-40 years	130.668
40-45 years	135.111
45-50 years	139.705
50-55 years	144.455
55-60 years	149.366
60-70 years	154.444
70-80 years	159.695
80-90 years	165.125
90-100 years	170.739
>100 years	176.544

*Ideal values are calculated based on our database of patient records

Misdiagnosis is more common than people think—and the consequences can be serious. Delayed treatment, unnecessary medication, or worse. If you want a second opinion on your blood work, one option is to upload it to a site like wholebodyprotocol.com, where world-class doctors review your results. They charge a small fee—around $90 (though you'll want to check the latest price as it fluctuates)—and email you a detailed report. With over 12 million people affected by misdiagnosis every year, that little bit of extra peace of mind can go a long way.

Some examples of conditions that increase or decrease LDH levels include:

• Acute kidney disease
• Acute liver disease
• Sepsis
• Infections such as infectious mononucleosis
• Pancreatitis

Normal range of LDH found among women :100-190 U/L

Ideal values of LDH depending on age (female) :

Age	Ideal LDH value
<5 years	103.502
5-10 years	107.127
10-15 years	110.879
15-20 years	114.762
20-25 years	118.781
25-30 years	122.941
30-35 years	127.246
35-40 years	131.702
40-45 years	136.314
45-50 years	141.088
50-55 years	146.029
55-60 years	151.143
60-70 years	156.436
70-80 years	161.914
80-90 years	167.584
90-100 years	173.453
>100 years	179.527

If you take a LDH blood test and the results are not in the normal range (100-190 U/L), your physician may recommend more tests to figure out the problem. You might also get this test if your physician thinks you have some other disease.

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How the LDH Test Is Done :

When your doctor orders a LDH test, it involves a straightforward blood draw to measure your LDH levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your LDH test results are usually available within a few hours.

Medical References

• MedlinePlus – Lactate Dehydrogenase (LDH) Test
• Cleveland Clinic – LDH (Lactate Dehydrogenase) Test: What It Is & Results
• MedlinePlus – LDH isoenzyme blood test