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Karyotype, GTG-banding - Bone Marrow Aspirate

Alternate test name

Chromosome Analysis

Gene name / Alternate gene name
  • All chromosomes
Lab area
Genome Diagnostics - Cytogenetics
Method and equipment
Direct preparation and unstimulated 24 hour culture; G-banding
Expected turn-around time
2-3 weeks
Specimen type

Bone Marrow Aspirate;
or Peripheral Blood

Specimen requirements

1.5 mL minimum; 2-3 mL if possible

Storage and transportation

Maintain at room temperature. Do not refrigerate or freeze. Ship sample overnight at room temperature for receipt at SickKids Cytogenetics Laboratory within 24 hours of collection.

Special requirements

Collect sample in sodium heparin (if possible 100 u.s.p. unit/mL of preservative-free Sodium Heparin)

For aspirate: relocate needle prior to sampling if possible.

If the bone marrow aspirate sample is from a new diagnosis leukemia patient, and is less than the recommended volume, submit peripheral blood in sodium heparin in addition to bone marrow aspirate.

Shipping information
The Hospital for Sick Children
Division of Genome Diagnostics
555 University Avenue, Black Wing, Room 3416
Toronto, ON
M5G 1X8
Phone: 416-813-7200 ext. 2
Hours: Monday to Friday, 8 a.m. to 4:30 p.m.
Off hours: Please send to Rapid Response Laboratory, 555 University Avenue, Room 3642
Email Molecular Lab:
Email Cytogenetics:
Background and clinical significance

Pediatric hematological disorders often have recurrent chromosome changes that correlate with diagnosis and prognosis.

Disease condition

Pediatric Leukemia, Myelodysplastic sydrome, Aplastic anemia or Cytopenia, Query lymphoma/solid tumour bone marrow involvement

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