Ordering Guidance

This test is only performed on specimens from patients with acute myeloid leukemia (AML) who are 30 years of age or younger.

This test should NOT be used to screen for residual acute myeloid leukemia (AML).

Minimal residual disease (MRD) monitoring in patients with AML known to have either t(15;17) with PML::RARA fusion, inv(16) or t(16;16) with MYH11::CBFB fusion, or t(8;21) with RUNX1T1::RUNX1 fusion should be performed by quantitative reverse transcriptase polymerase chain reaction (RT-PCR) and NOT by FISH testing.

It is recommended that MRD monitoring in AML patients be performed by AML-MRD Flow cytometry rather than fluorescence in situ hybridization (FISH) testing using individual FISH probe sets. This is particularly true for the deletion/monosomy probe sets (5 and 7) which have cutoffs that exceed 10% of nuclei.

If limited AML FISH probes are preferred, order AMLMF / Acute Myeloid Leukemia (AML), Specified FISH, Varies and request specific probes for targeted abnormalities.

This test is intended for instances when the entire AML FISH panel is needed for a pediatric patient.

If this test is ordered on a patient 31 years of age or older, this test will be canceled and automatically reordered by the laboratory as AMLAF / Acute Myeloid Leukemia (AML), FISH, Adult, Varies.

If this test is ordered and the laboratory is informed that the patient is 30 years of age or younger AND is on a Children's Oncology Group (COG) protocol, this test will be canceled and automatically reordered by the laboratory as COGMF / Acute Myeloid Leukemia (AML), Children's Oncology Group Enrollment Testing, FISH, Varies.

If either (or both) BALPF / B-Cell Acute Lymphoblastic Leukemia/Lymphoma (ALL), Pediatric, FISH, Varies or TALPF / T-Cell Acute Lymphoblastic Leukemia/Lymphoma (ALL), FISH, Pediatric, Varies, is ordered concurrently with this test, the laboratory may cancel this test and automatically reorder as AMLMF / Acute Myeloid Leukemia (AML), Specified FISH, Varies with the following FISH probes: RUNX1T1/RUNX1, PML/RARA, MYH11/CBFB, RPN1/MECOM, DEK/NUP214, D5S630/EGFR1, D7Z1/D7S486, break-apart ETV6, KAT6A/CREBBP, GLIS2/CBFA2T3, break-apart NUP98, and RBM15/MKL1. If an abnormality is identified that would result in reflex testing in this test, the same reflex testing will be performed in the AMLMF. This cancellation is necessary to avoid duplicate testing. The break-apart MLL probe set will still be performed as part of either the pediatric B-ALL or T-ALL FISH panel.

For testing paraffin-embedded tissue samples from patients with AML/myeloid sarcoma, order MSTF / Myeloid Sarcoma, FISH, Tissue.

Shipping Instructions

Advise Express Mail or equivalent if not on courier service.

Necessary Information

A reason for testing and a flow cytometry and/or a bone marrow pathology report are requested with each specimen. The laboratory will not reject testing if this information is not provided; however, appropriate testing and/or interpretation may be compromised or delayed in some instances. If not provided, an appropriate indication for testing may be entered by Mayo Clinic Laboratories.

Specimen Required

Submit only 1 of the following specimens:

Preferred:

Specimen Type: Bone marrow

Container/Tube:

Preferred: Yellow top (ACD)

Acceptable: Green top (heparin) or lavender top (EDTA)

Specimen Volume: 2 to 3 mL

Collection Instructions:

1. It is preferable to send the first aspirate from the bone marrow collection.

2. Invert several times to mix bone marrow.

3. Send bone marrow in original tube. Do not aliquot.

Acceptable:

Specimen Type: Whole blood

Container/Tube:

Preferred: Yellow top (ACD)

Acceptable: Green top (heparin) or lavender top (EDTA)

Specimen Volume: 6 mL

Collection Instructions:

1. Invert several times to mix blood.

2. Send whole blood in original tube. Do not aliquot.