Alkaline Phosphatase · high result
What does a high Alkaline Phosphatase mean?
Short answer
Alkaline phosphatase comes from liver (bile ducts) and bone, so a high level points to one or the other. Bile-duct blockage, fatty liver, certain medications and liver infiltration raise the liver form; growth in adolescents, healing fractures, Paget's disease, vitamin D deficiency and bone metastases raise the bone form. Pregnancy raises it normally. GGT tells the two apart — high GGT points to the liver.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
What is the normal range for Alkaline Phosphatase?
- age 18+: 40.0 – 129 U/L
Often reflects bile-flow problems, liver disease, or bone turnover (including normal growth in adolescents).
Full reference table, citations and testing options: Alkaline Phosphatase biomarker page.
What are the common causes of high Alkaline Phosphatase?
- Bile-duct obstruction or cholestasis (gallstones, primary biliary cholangitis, medications)
- Fatty liver, alcohol, other liver disease
- Bone: adolescent growth, healing fractures, Paget's disease, vitamin D deficiency, hyperparathyroidism, bone metastases
- Pregnancy (third trimester, normal)
- Some medications and blood type variants after fatty meals
What symptoms go with high Alkaline Phosphatase?
- Often none
- Itching, jaundice, right-upper abdominal pain (liver/biliary)
- Bone pain (bone causes)
What do clinicians usually check next?
- GGT — raised confirms a liver source; normal points to bone
- Bilirubin, ALT, AST
- 25-hydroxyvitamin D, calcium, PTH if bone source
- Ultrasound for a liver/biliary source
Follow-up tests available at TestWell: ALT (Alanine Aminotransferase) ($18.99), GGT (Gamma-Glutamyl Transferase) ($19.99), Calcium ($26.99), PTH (Parathyroid Hormone) ($59.99).
How do you recheck Alkaline Phosphatase?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| General Wellness Panel | Panel · 4 tests | $89.99 | Yes | 1–3 business days |
| Kidney Health Panel | Panel · 4 tests | $64.99 | Yes | 2–4 business days |
| Gut Health Panel | Panel · 5 tests | $129.99 | No | 3–7 business days |
| Comprehensive Metabolic Panel | Test · 14 biomarkers | $22.99 | Yes | 1–3 business days |
Common questions
High alkaline phosphatase but normal GGT — what does that mean?
Bone is the likely source: growth, a healing fracture, vitamin D deficiency or Paget's disease. Calcium, vitamin D and PTH are the next checks.
Sources
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.