Alkaline Phosphatase— Normal Range & What Your Result Means

Liver/bone enzyme

Normal Alkaline Phosphatase range (ALP, U/L)

  • Adults44–147 U/L

Ranges are typical adult values and vary between labs. Use the range on your own report.

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What is Alkaline Phosphatase (ALP)?

Alkaline Phosphatase is measured as part of a liver function panel. Your ALP is normal.

What does a high Alkaline Phosphatase mean?

Elevated ALP can come from the liver (bile duct obstruction, fatty liver) or bones (fractures, Paget's disease). Your doctor can investigate the source based on your symptoms.

What does a low Alkaline Phosphatase mean?

Low ALP is rarely a concern — occasionally related to hypothyroidism or nutritional deficiencies.

Understand your whole report, not just one number

A single value rarely tells the full story — Alkaline Phosphatase is best read alongside the rest of your panel. Paste your values or upload your report and get a plain-English explanation of every marker, with the important results flagged.

Alkaline Phosphatase: frequently asked questions

What is a normal Alkaline Phosphatase level?

A normal Alkaline Phosphatase (ALP) level is 44–147 U/L for adults. Reference ranges vary slightly between laboratories, so always compare against the range printed on your own report.

What does a high Alkaline Phosphatase mean?

Elevated ALP can come from the liver (bile duct obstruction, fatty liver) or bones (fractures, Paget's disease). Your doctor can investigate the source based on your symptoms.

What does a low Alkaline Phosphatase mean?

Low ALP is rarely a concern — occasionally related to hypothyroidism or nutritional deficiencies.

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