Leukocyte Alkaline Phosphatase Stain (LAP)
Optimizing Laboratory Testing for Hematologic
Disorders Series
Low LAP Scores* Do Not Indicate Myeloid Malignancy: A Mayo 1-Year Experience

September 2010
In addition, a low LAP score did not always indicate a myeloid malignancy. As you can see, there were a variety of non-myeloid malignancies and non-malignant conditions that were associated with a low LAP score, again pointing out the lack of diagnostic specificity of a low LAP score.
Myeloid Malignancy |
Jump to section:
- Introduction
- Optimizing Laboratory Testing for Hematologic Disorders Series
- The Big Picture: We Need to Focus On...
- LAP: A Test That Time Has Passed By
- Abbreviations
- LAP: Assay History
- LAP: Original Clinical Utility
- LAP Procedure—an Inexact Science!
- Typical Staining Type Reaction
- Subjective Nature of the Scoring Process
- LAP Scoring Example
- LAP Discontinued at Mayo Clinic
- Low LAP Scores* Not Specific for CML: A Mayo 1-Year Experience
- Low LAP Scores* Do Not Indicate Myeloid Malignancy: A Mayo 1-Year Experience
- High LAP Scores* Not Specific for PV: A Mayo 1-Year Experience
- High LAP Scores* Do Not Indicate Myeloid Malignancy: A Mayo 1-Year Experience
- LAP: A Test Whose Time Has Passed
- Consequences of an Abnormal LAP
- Alternatives to LAP
- Alternatives to LAP: BCR/ABL
- Alternatives to LAP: JAK2
- Conclusions
- Questions?