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SNP Array for Blood analysis

Item Value
Approval req'd? Yes, if not ordered by Genetics, Neurology or Neonatal Intensive Care Unit faculty or fellows. Requests on inpatients require approval from
Cytogenetics/Array staff.
Available Stat? No
Test code SNPAB
Performed by Medical Genomics - Cytogenetics (Microarray)
Method 850K SNP Array
Collection Instructions Insurance pre-authorization required for outpatients

Only collect samples Monday - Friday and avoid holidays.

Do not collect sample in lithium heparin (Lt. Green top).

Transport sample at room temperature as soon as possible to lab. If transport is delayed refrigerate sample.

For UCSF Samples (from remote sites) Click here for sample collection instructions

For NON-UCSF Samples Click here for Requisition form & Account set-up instructions. Note we only do institutional billing.
Container type Lavender top preferred , Dark green top acceptable
Amount to Collect
Adult 5 mL blood
Infant/Child 3 mL blood
Sample type EDTA or heparinized whole blood

Extracted DNA may also be acceptable, contact Cytogenetics 514-8964.
Preferred volume
Adult 5 mL blood
Infant/Child 3 mL blood
Extracted DNA 10 micrograms
Min. Volume
Adult 2 mL blood
Infant/Child 2 mL blood
Extracted DNA 10 micrograms
UCSF Rejection Criteria Insufficient volume, unlabeled tubes, clotted samples, Samples received in
Lithium-heparin (Lt. Green top) tubes.
Processing notes Refrigerate samples DO NOT CENTRIFUGE OR FREEZE. Transport asap to China Basin Cytogenetics

For questions, contact the microarray laboratory at 514-8964
Normal range
Synonyms SNP array blood
Stability Room temperature 4 days, refrigerated 2 weeks.
Turn around times 10-14 days
Additional information Limitations
Genomic aberrations that may not be detected by SNP array assay include:
- Balanced rearrangement (i.e. balanced translocation, insertion or inversion) and tetraploidy resulted from endoduplication.
- Low level (<30%) mosaicism for unbalanced rearrangements and aneuploidy
- Nucleotide sequence changes (i.e. point mutation or small insertion/deletion below the level of detection or cut-off thresholds)
Imbalances of regions not represented on the array
- Genomic changes in mixed samples (i.e. prenatal samples with maternal cell contamination)
CPT coding 81229

Not: Additional charges for MCC studies when necessary, culture set-up fees may apply
LDT or Mod FDA? Yes
Last Updated 7/6/2015 8:34:45 AM
Entry Number 1618
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