Alkaline Phosphatase (1004)

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CPT Code:


Test Type: Serum Kit Based
Stability Time:


Refrigerated: 7 days

Reference Range:
  • Optimal: <130 U/L
  • Borderline: 130-200 U/L
  • Increased Risk: >200 U/L
  • Alert: >400 U/L


Alkaline phosphatase is an enzyme that is found primarily in liver and biliary tract cells, as well as bone. Elevated levels of alkaline phosphatase may indicate injury to the liver or biliary tracts cells or bone.

Methodology - Colorimetric

Collection Details:

Collection Instructions:

Preferred Specimen

1.0 mL serum (0.5 mL minimum) collected in serum separator tube (SST/Tiger Top)

Transport Temperature

Refrigerated (ship on frozen cold packs)