LEUKOCYTE ALKALINE PHOSPHATASE (LAP) SCORE

Specimen Required
Draw blood in a green sodium or lithium heparin tube. Send 5.0 mL whole blood (1.0 mL minimum) room temperature. Make smears within 24 hours of collection, using slides with frosted edge. Please label in pencil on frosted edge. Send 6 unfixed, unstained smears. Samples must be sent the day collected, and must be collected Sunday-Wednesday only. PROTECT FROM LIGHT.

Rejection Criteria
EDTA whole blood, poorly prepared smears (too thick or no feather edge), broken or fixed smears, specimens that have been spun, and smears made from blood older than 24 hours.

Methodology
Cytochemical stain

Stability
Blood: Room Temperature: 24 hours; Refrigerated: Unacceptable; Frozen: Unacceptable
Unfixed Smears: Room Temperature: 7 days; Refrigerated: Unacceptable; Frozen: Unacceptable

Reference Range
Females: 33-149 (no units)
Males: 22-124 (no units)

Performed
Monday-Friday

Turnaround Time3-6 days
Test CodesLAPAR
36-19340
CPT-4 Code (s)
85540
LOINC Codes
4659-9

Warde
Medical
Laboratory