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SNP Array, Family Follow-Up

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. Insurance authorization required.
Available Stat? No
Test code PSNPA
Test group Microarray
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
Preferred volume
Adult 5 mL whole blood
Infant/Child 3 mL whole blood
Extracted DNA 10 µg (mcg)

Min. Volume
Adult 2 mL whole blood
Infant/Child 2 mL whole blood
Extracted DNA 10 µg (mcg)
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 Parental SNP Array
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
LOINC code 62375-1
LDT or Mod FDA? Yes
Last Updated 7/6/2015 8:35:25 AM
Entry Number 1633
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