Is LDH 423 high, normal or dangerous? What does Lactate dehydrogenase level 423 mean?

📅 Medical Review Date: October 16, 2025

Your LDH level of 423 is a High LDH level.

An LDH level of 423 U/L usually means tissue damage has occurred somewhere in the body. It suggests cell injury or destruction. High levels of LDH can cause fatigue, muscle pain, shortness of breath, dark urine, fever, and jaundice depending on which tissue is affected. This can be caused by heart attack, liver disease, kidney disease, muscle injury, or certain cancers. Further tests are often needed to identify the cause and guide appropriate treatment.

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	104.23
5-10 years	108.639
10-15 years	113.234
15-20 years	118.024
20-25 years	123.016
25-30 years	128.22
30-35 years	133.644
35-40 years	139.297
40-45 years	145.189
45-50 years	151.33
50-55 years	157.731
55-60 years	164.403
60-70 years	171.357
70-80 years	178.605
80-90 years	186.16
90-100 years	185.827
>100 years	185.494

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

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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	104.357
5-10 years	108.904
10-15 years	113.649
15-20 years	118.601
20-25 years	123.768
25-30 years	129.16
30-35 years	134.787
35-40 years	140.66
40-45 years	146.788
45-50 years	153.183
50-55 years	159.857
55-60 years	166.822
60-70 years	174.09
70-80 years	181.675
80-90 years	189.59
90-100 years	189.23
>100 years	188.871

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