Is Serum Cholesterol 5.66 high, normal or dangerous? What does Serum Cholesterol level 5.66 mean?

📅 Medical Review Date: February 25, 2026

Your Serum Cholesterol level of 5.66 is a High Serum Cholesterol level.

High Serum Cholesterol levels may indicate underlying health problems. The normal range is typically between 2.59 mmol/L and 5.15 mmol/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 Serum Cholesterol range for men is :2.59 - 5.15 mmol/L

Ideal values of Serum Cholesterol depending on age (male) :

Age	Ideal Serum Cholesterol value
<5 years	2.737
5-10 years	2.892
10-15 years	3.056
15-20 years	3.229
20-25 years	3.412
25-30 years	3.605
30-35 years	3.809
35-40 years	4.025
40-45 years	4.253
45-50 years	4.494
50-55 years	4.748
55-60 years	5.017
60-70 years	5.001
70-80 years	4.985
80-90 years	4.969
90-100 years	4.953
>100 years	4.937

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

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Normal range of Serum Cholesterol found among women :2.59-5.15 mmol/L

Ideal values of Serum Cholesterol depending on age (female) :

Age	Ideal Serum Cholesterol value
<5 years	2.741
5-10 years	2.901
10-15 years	3.07
15-20 years	3.249
20-25 years	3.438
25-30 years	3.638
30-35 years	3.85
35-40 years	4.074
40-45 years	4.312
45-50 years	4.563
50-55 years	4.829
55-60 years	5.111
60-70 years	5.094
70-80 years	5.077
80-90 years	5.06
90-100 years	5.043
>100 years	5.026

If you take a Serum Cholesterol blood test and the results are not in the normal range (2.59-5.15 mmol/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 Serum Cholesterol Test Is Done :

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

Medical References

• Mayo Clinic – Cholesterol test
• MedlinePlus – Cholesterol Levels
• Cleveland Clinic – Cholesterol: Understanding Levels & Numbers