Alkaline Phosphatase, Serum normal range — check your value

Roughly 40 to 130 U/L in adults. Children and teenagers normally run much higher because their bones are growing.

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Your Alkaline Phosphatase, Serum test value

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Alkaline Phosphatase, Serum

U/L

What Alkaline Phosphatase, Serum measures

An enzyme from the liver, bile ducts and bone, raised when bile flow is obstructed or bone turnover increases.

Alkaline Phosphatase, Serum normal range chart

ResultAlkaline Phosphatase, Serum (U/L)

Below rangeBelow 40

In range40 – 150

Above range150 and above

These bands are for female, 31–45 years. Enter your age and gender above to see the bands for you. The table below shows the range for every age and gender.

Alkaline Phosphatase, Serum normal range by age and gender

AgeMaleFemale

0–1 years110 – 320 U/L110 – 320 U/L

2–6 years0 – 500 U/L0 – 500 U/L

7–11 years0 – 500 U/L0 – 500 U/L

12–17 years40 – 150 U/L40 – 150 U/L

18–30 years40 – 150 U/L40 – 150 U/L

31–45 years40 – 150 U/L40 – 150 U/L

46–60 years40 – 150 U/L40 – 150 U/L

60 years and above40 – 150 U/L40 – 150 U/L

What a high Alkaline Phosphatase, Serum means, and common causes

An enzyme found mainly in the liver, bile ducts and bone is raised. The pattern of the rest of the liver panel tells you which source it came from.

Common causes: Bile duct blockage from gallstones, fatty liver, some medicines, bone conditions including vitamin D deficiency and Paget's disease, healing fractures, pregnancy, and normal growth in children and teenagers.

What a low Alkaline Phosphatase, Serum means, and common causes

A low level is unusual and seldom significant.

Common causes: Severe malnutrition, zinc or magnesium deficiency, hypothyroidism, and the rare inherited condition hypophosphatasia.

Frequently asked questions

Roughly 40 to 130 U/L in adults. Children and teenagers normally run much higher because their bones are growing.

No. Bone is the other main source. A GGT test taken alongside usually settles whether the rise is coming from the liver or from bone.

Yes, and it is a common reason in India. Long-standing deficiency increases bone turnover, which pushes the enzyme up.

Yeh liver, bile duct ya haddi se aa sakta hai. Doctor GGT aur vitamin D dekh kar kaaran pata karte hain.

Please note. This page explains what a number means against reference ranges for your age and gender. It does not diagnose anything, cannot see the rest of your report, and is no substitute for a doctor. If your lab’s printed range differs, your lab’s range applies.