Is Serum Bilirubin total 18 normal, high or low? What does Serum Bilirubin total level 18 mean?

📅 Medical Review Date: April 4, 2026

Your Serum Bilirubin total level of 18 is a Normal Serum Bilirubin total level.

Normal Serum Bilirubin total levels may indicate underlying health problems. The normal range is typically between 2 umol/L and 21 umol/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 Bilirubin total range for men is :2 - 21 umol/L

Ideal values of Serum Bilirubin total depending on age (male) :

Age	Ideal Serum Bilirubin total value
<5 years	2.036
5-10 years	2.073
10-15 years	2.11
15-20 years	2.148
20-25 years	2.187
25-30 years	2.226
30-35 years	2.266
35-40 years	2.307
40-45 years	2.349
45-50 years	2.391
50-55 years	2.434
55-60 years	2.478
60-70 years	2.523
70-80 years	2.568
80-90 years	2.614
90-100 years	2.661
>100 years	2.709

*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.

Normal range of Serum Bilirubin total found among women :2-21 umol/L

Ideal values of Serum Bilirubin total depending on age (female) :

Age	Ideal Serum Bilirubin total value
<5 years	2.037
5-10 years	2.075
10-15 years	2.113
15-20 years	2.152
20-25 years	2.192
25-30 years	2.233
30-35 years	2.274
35-40 years	2.316
40-45 years	2.359
45-50 years	2.403
50-55 years	2.448
55-60 years	2.493
60-70 years	2.539
70-80 years	2.586
80-90 years	2.634
90-100 years	2.683
>100 years	2.733

If you take a Serum Bilirubin total blood test and the results are not in the normal range (2-21 umol/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 Bilirubin total Test Is Done :

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

Medical References

• Cleveland Clinic – Bilirubin Test: Understanding High vs. Low Levels & Causes
• Mayo Clinic – Bilirubin test
• MedlinePlus – Bilirubin Blood Test
• WebMD – Bilirubin Test: High vs. Low Levels, Direct vs. Indirect