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Labcorp Oklahoma, Inc.
Test Directory


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Alkaline Phosphatase Isoenzymes

Order Name ALK P ISOS
Test Number: 5004110
Revision Date 06/01/2026
Test Name Methodology LOINC Code
Alkaline Phosphatase Isoenzymes
Electrophoresis 24332-9 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1.6 mL (0.8 mL ) Serum Clot Activator (SST or Red No-Gel) Refrigerated
Alternate 1 1.6 mL (0.8 mL ) Plasma Lithium Heparin PST (Light Green Top) Refrigerated
Instructions Notes: 1.6mL (Minimum 0.8mL Note: This volume Does NOT allow for repeat testing.)
Specimen Type: Red-top tube or gel-barrier tube or plasma from Lithium-heparin tube
Specimen Storage: Refrigerate at 2°C to 8°C as soon as possible after collection.
Specimen Collection: Serum: Separate serum from cells as soon as possible after the blood is allowed to clot.  Plasma: Centrifuge and transfer separated heparin plasma to a plastic transport tube and label as Li-heparin plasma.
Special Instructions: State patient's age and sex on the request form. NOTE: This panel reports the isoenzyme fractions in units of measure of IU/L ("international units per liter").
Cause for Rejection: Patient not fasting; citrate, oxalate, or EDTA anticoagulated plasma
Specimen Stability: Ambient: 7 days, Refrigerated : 7 days, Frozen: 3 months
GENERAL INFORMATION
Expected TAT 3 - 5 days  
Performing Labcorp Test Code 001637 
Notes
Result Code Result Name LOINC Code
3655900 Alkaline Phosphatase 6768-6
5197570 AlkP Liver Fract % 15015-1
5197571 AlkP Liver Fract IU/L 1779-8
5197572 AlkP Bone Fract % 15013-6
5197573 AlkP Bone Fract IU/L 1777-2
5197574 AlkP Intestinal Frac.% 15014-4
5197575 AlkP Intestinal Frac IU/L 1778-0
5197576 AlkP Iso Note: n/a
CPT Code(s) 84075, 84080
Lab Section Reference Lab