Is Serum Phosphorus 1.55 high, normal or dangerous? What does Serum Phosphorus level 1.55 mean?

📅 Medical Review Date: March 13, 2026

Your Serum Phosphorus level of 1.55 is a High Serum Phosphorus level.

High Serum Phosphorus levels may indicate underlying health problems. The normal range is typically between 0.97 mmol/L and 1.45 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 Phosphorus range for men is :0.97 - 1.45 mmol/L

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

Age	Ideal Serum Phosphorus value
<5 years	0.985
5-10 years	1
10-15 years	1.016
15-20 years	1.032
20-25 years	1.048
25-30 years	1.064
30-35 years	1.08
35-40 years	1.097
40-45 years	1.114
45-50 years	1.131
50-55 years	1.149
55-60 years	1.167
60-70 years	1.185
70-80 years	1.203
80-90 years	1.222
90-100 years	1.241
>100 years	1.26

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

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Normal range of Serum Phosphorus found among women :0.97-1.45 mmol/L

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

Age	Ideal Serum Phosphorus value
<5 years	0.985
5-10 years	1.001
10-15 years	1.017
15-20 years	1.033
20-25 years	1.049
25-30 years	1.066
30-35 years	1.083
35-40 years	1.1
40-45 years	1.118
45-50 years	1.136
50-55 years	1.154
55-60 years	1.172
60-70 years	1.191
70-80 years	1.21
80-90 years	1.229
90-100 years	1.249
>100 years	1.269

If you take a Serum Phosphorus blood test and the results are not in the normal range (0.97-1.45 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 Phosphorus Test Is Done :

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

Medical References

• MedlinePlus – Phosphate in Blood
• WebMD – Phosphate Blood Test: Purpose, High vs. Low vs. Normal Levels
• Cleveland Clinic – Phosphorus: What It Is, Why You Need It & Blood Tests
• MedlinePlus – Phosphorus blood test