Item Value
Test name SNP Array for Prenatal Analysis
Available Stat? No
Turn around times For direct array analysis, 3-8 days from the time sample is received in laboratory and insurance authorization is obtained; TAT will be longer if reflexed from normal chromosome analysis or if culture is required due to insufficient sample volume or quality (ordering clinician will be notified)
Performed by Medical Genomics - Cytogenetics (Microarray)
Normal range
Container type Sterile centrifuge tube, CVS in transport media provided by lab
Amount to Collect Direct Array ONLY:

Amniotic fluid 25 mL non-bloody fluid (20 mL for array 5 mL for backup)
Placental Villi 20-25 mg
Cultured cells 2 confluent T25 flasks


Chromosome analysis with reflex to array if normal

Amniotic fluid 30 mL non-bloody fluid
Placental Villi 30 mg


Additional fluid or villi may be needed if additional tests are ordered

Aneuvysion FISH add 5 mL amniotic fluid or 5 mg villi.
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.
Sample type Amniotic fluid or chorionic villi only

If you have additional questions regarding this test, please call: 415-353-1667