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HelpTest Code ALPI Alkaline Phosphatase Isoenzymes, Serum
Specimen Required
Only orderable as part of a profile. For more information see ALKP / Alkaline Phosphatase, Total and Isoenzymes, Serum.
Patient Preparation: Patient must fast for 8 hours.
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions:
1. Within 2 hours of collection, centrifuge the specimen.
2. For red top tubes, immediately aliquot into a plastic vial.
3. For serum gel tubes, serum may sit on gel refrigerated but must be aliquoted within 7 days.
Method Name
Only orderable as part of a profile. For more information see ALKP / Alkaline Phosphatase, Total and Isoenzymes, Serum.
Electrophoresis
Specimen Type
SerumSpecimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Frozen (preferred) | 14 days |
| Ambient | 7 days | |
| Refrigerated | 7 days |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
| Gross icterus | Reject |
Clinical Information
Alkaline phosphatase (ALP) is present in a number of tissues including liver, bone, intestine, and placenta. The activity of ALP found in serum is a composite of isoenzymes from those sites. Serum ALP is of interest in the diagnosis of hepatobiliary disease and bone disease associated with increased osteoblastic activity.
A rise in liver ALP activity occurs with all forms of cholestasis, particularly with obstructive jaundice.
Bone ALP is elevated in disorders of the skeletal system that involve osteoblast hyperactivity and bone remodeling, such as Paget disease, rickets, osteomalacia, fractures, and malignant tumors.
Moderate elevation ALP may be seen in other disorders such as Hodgkin disease, congestive heart failure, ulcerative colitis, regional enteritis, and intra-abdominal bacterial infections.
Reference Values
Only orderable as part of a profile. For more information see ALKP / Alkaline Phosphatase, Total and Isoenzymes, Serum.
Ages:
≤17 years: Reference values have not been established for patients younger than 18 years.
≥18 years:
Liver %: 30.2-74.7
Liver U/L: 15.8-71.9
Bone %: 23.8-68.3
Bone U/L: 12.0-56.7
Intestine %: ≤22.5
Intestine U/L: ≤12.6
Day(s) Performed
Tuesday through Saturday
Report Available
3 to 5 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
84080