Test Catalog

Test ID: PPAP    
Parental Sample Prep for Prenatal Microarray Testing

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

This test can only be ordered on the parents when a prenatal microarray test has been ordered on the fetal sample.


This test ID contains no charge and serves as a way to correlate proband and parental specimens. If additional testing is warranted, the appropriate tests will be added. 


When prenatal microarray analysis is ordered, parental blood samples are collected and prepared for confirmation studies should an abnormality be detected on the prenatal sample. If an abnormality is detected on the fetal sample, the most appropriate testing (microarray, FISH, or chromosome analysis) to aid in the interpretation of the prenatal result is performed on the parental samples. A paternal blood sample is desired but not required.


Maternal cell contamination testing will be performed on the maternal blood and prenatal samples to rule out the presence of maternal cells in the fetal sample.

Specimen Type Describes the specimen type validated for testing

Whole blood

Necessary Information

1. The reason for referral is required.

2. Include the name listed on the prenatal sample that was submitted for prenatal microarray analysis.

Specimen Required Defines the optimal specimen required to perform the test and the preferred volume to complete testing

This test requires 2 blood specimens: 1 sodium heparin and 1 EDTA.


Specimen Type: Whole blood
Container/Tube: Green top (sodium heparin) and lavender top (EDTA)
Specimen Volume: 

EDTA: 3 mL

Sodium heparin: 4 mL
Collection Instructions:
1. Invert several times to mix blood.
2. Send specimens in original tubes.

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen TypeTemperatureTimeSpecial Container
Whole bloodAmbient (preferred)