Is Alkaline phosphatase 19 low, normal or dangerous? What does ALP level 19 mean?

📅 Medical Review Date: January 19, 2026

Your Alkaline phosphatase level of 19 is a Low Alkaline phosphatase level.

An alkaline phosphatase level of 19 U/L usually means bone turnover or liver activity is reduced. It suggests possible nutritional deficiencies. Low levels of alkaline phosphatase can cause fatigue, weakness, bone pain, frequent fractures, and poor growth in children. This can be caused by hypophosphatasia, malnutrition, Wilson's disease, or hypothyroidism. Further tests are often needed to identify the cause and guide appropriate treatment.

Low Alkaline phosphatase levels may indicate underlying health problems. The normal range is typically between 30 U/L and 120 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 Alkaline phosphatase range for men is :30 - 120 U/L

Ideal values of Alkaline phosphatase depending on age (male) :

Age	Ideal Alkaline phosphatase value
<5 years	30.57
5-10 years	31.151
10-15 years	31.743
15-20 years	32.346
20-25 years	32.961
25-30 years	33.587
30-35 years	34.225
35-40 years	34.875
40-45 years	35.538
45-50 years	36.213
50-55 years	36.901
55-60 years	37.602
60-70 years	38.316
70-80 years	39.044
80-90 years	39.786
90-100 years	40.542
>100 years	41.312

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

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1,51,150

Total number of patients treated

A video message on the treatment of your low Alkaline phosphatase level

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Some examples of conditions that increase or decrease Alkaline phosphatase levels include:

• Alcohol abuse
• Ulcerative colitis
• Blockage of the bile ducts.
• Insulin resistance
• Congestive heart failure

Receive world-class medical opinion about your low Alkaline phosphatase levels over email.Upload blood test report now

Normal range of Alkaline phosphatase found among women :30-120 U/L

Ideal values of Alkaline phosphatase depending on age (female) :

Age	Ideal Alkaline phosphatase value
<5 years	30.587
5-10 years	31.186
10-15 years	31.796
15-20 years	32.418
20-25 years	33.052
25-30 years	33.699
30-35 years	34.358
35-40 years	35.03
40-45 years	35.716
45-50 years	36.415
50-55 years	37.128
55-60 years	37.855
60-70 years	38.596
70-80 years	39.351
80-90 years	40.121
90-100 years	40.906
>100 years	41.707

If you take a Alkaline phosphatase blood test and the results are not in the normal range (30-120 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 Alkaline phosphatase Test Is Done :

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

Medical References

• Cleveland Clinic – Alkaline Phosphatase (ALP): What It Is, Causes & Treatment
• Mayo Clinic – Alkaline phosphatase (ALP) blood test
• MedlinePlus – Alkaline Phosphatase
• WebMD – Alkaline Phosphatase (ALP): Tests and Results

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