Leukocyte Alkaline Phosphatase
0049000
Ordering Recommendation
 
Mnemonic
LAP
Methodology
Cytochemical Stain
Performed
Mon-Fri
Reported
1-5 days  
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
  • Anatomic Pathology Test Request Form Recommended (ARUP form #32960)
Specimen Required
Patient Preparation
  
Collect
Green (sodium or lithium heparin).  
Specimen Preparation
Protect from light and pack accordingly to avoid breakage. Transport 5 mL whole blood (Min: 1 mL) AND 6 unfixed, well-prepared smears (Min: 6 smears)  
Storage/Transport Temperature
Room temperature. Send Sunday through Thursday only. Whole blood must be received within 24 hours of collection; smears must be made within 24 hours of collection and received within 7 days of collection.  
Unacceptable Conditions
Specimens collected in EDTA. Poorly prepared smears (too thick or no feather edge). Broken or fixed smears.  Specimens that have been spun.  Smears made from anything other than heparin.  Smears made from blood older than 24 hours  
Remarks
  
Stability
 Blood: Ambient: 24 hours; Refrigerated: Unacceptable; Frozen: Unacceptable
Unfixed Smears:
Ambient: 1 week; Refrigerated: Unacceptable; Frozen: Unacceptable  
Reference Interval
Female: 33-149 (no units)
Male: 22-124 (no units)  
Interpretive Data
 
Note
 
CPT Code(s)
85540
Components
Component Test Code*Component Chart NameLOINC
0049000Leukocyte Alkaline Phosphatase4659-9
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • LAP