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HelpChromosome Analysis, Blood
Performing Laboratory
St. Louis Children's Hospital Sendout to Cytogenetics and Molecular Pathology Laboratory at Washington University
Specimen Requirements
Specimen Type: Blood
Patient Preparation: None
Container/Tube
Preferred:
GreenNaHep Vacutainer®.
(DARK green-top no gel Sodium Heparin tube)
Acceptable:
Collection Volume:
Infants: 1.0-2.0 mL
Children: 3.0-5.0 mL
Adults: 5.0-10.0 mL
Special Instructions:
Immediately invert tube gently 8-10 times after collection to ensure proper mixing of blood and anticoagulant (this will avoid specimen clotting). Forward promptly at ambient temperature only.
Send the EPIC Cytogenetics order requisition that prints when order released with specimen.
Sample Rejection
Clotted specimens
Specimens collected in other than Dark green-top NaHep (no gel) tubes.
Mislabeled or unlabeled specimens.
Logistics
Test Availability: Daily
Cut-off time: None
Days set up by performing lab: Monday-Friday
Turnaround Time: 14-21 Days
Reference Values
Reference Interval: Interpretive report will be provided
Critical Value: None established
Limitations
NA
Additional Information
FOR SLCH CORE LABORATORY USE ONLY
Lab Processing Instructions:
DO NOT SPIN.
Maintain at room temperature or refrigerate if sample cannot be delivered within 24 hours
Transport Temperature: Ambient
Analyte Stability:
Ambient: 24 hours
Refrigerated: 48 hours
Frozen: Unacceptable
Note: Send the EPIC Cytogenetics order requisition with specimen
Test Classification and CPT Code
88291, 88230, 88262, 88280
LOINC
NA
Last Reviewed
08/2025