Test Catalog

Test ID: CHRHB    
Chromosome Analysis, Hematologic Disorders, Blood

Useful For Suggests clinical disorders or settings where the test may be helpful

Assisting in the classification and follow-up of certain malignant hematological disorders when bone marrow is not available

Reflex Tests Lists tests that may or may not be performed, at an additional charge, depending on the result and interpretation of the initial tests.

Test IDReporting NameAvailable SeparatelyAlways Performed
_ML20Metaphases, 1-19No, (Bill Only)No
_M25Metaphases, 20-25No, (Bill Only)No
_MG25Metaphases, >25No, (Bill Only)No
_STACAg-Nor/CBL StainNo, (Bill Only)No

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

This test includes a charge for cell culture of fresh specimens and professional interpretation of results. Analysis charges will be incurred for total work performed, and generally include 2 banded karyograms and the analysis of 20 metaphase cells. If no metaphase cells are available for analysis, no analysis charges will be incurred. If additional analysis work is required, additional charges may be incurred.


This test is not appropriate for detecting constitutional/congenital chromosome abnormalities. If this test is ordered with a reason for referral indicating a concern for a constitutional/congenital chromosome abnormality, the test will be cancelled and CHRCB / Chromosome Analysis, Congenital Disorders, Blood will be added and performed as the appropriate test.


If this test is ordered and the laboratory is informed that the patient is on a COG protocol, this test will be canceled and automatically reordered by the laboratory as COGBL / Chromosome Analysis, Hematologic Disorders, Children’s Oncology Group Enrollment Testing, Blood.

Special Instructions Library of PDFs including pertinent information and forms related to the test

Method Name A short description of the method used to perform the test

Cell Culture without Mitogens* followed by Chromosome Analysis*


*In addition to the cell culture without mitogens, a CpG stimulated culture will be added and 10 additional cells will be analyzed for any specimen received from a patient age 30 or older with a reason for referral of chronic lymphocytic leukemia (CLL), small lymphocytic lymphoma (SLL), lymphocytosis, Waldenstrom macroglobulinemia, or when CLLF / Chronic Lymphocytic Leukemia (CLL), FISH is ordered concurrently.

NY State Available Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name Lists a shorter or abbreviated version of the Published Name for a test

Chromosomes, Hematologic, Blood

Aliases Lists additional common names for a test, as an aid in searching

Chromosome Analysis, Peripheral Blood Unstimulated
Hematologic Chromosome Analysis
Hematologic Karyotype
Karyotype, Peripheral Blood Unstimulated