Ordering Information

Epic Orderable Name:  Prenatal Array

Epic Test Id:  LAB46448

Testing Includes:  SNP-based microarray analysis

Aliases:  array, snp, prenatal, comparative microarray analysis, CMA, microarray, Cytogenomics, Cytogenetics, Cytogenetic analysis

Testing Schedule:  Weekly

Turnaround Time:  14 Days

Order Priorities:  Routine

Methodology:  Microarray

Ordering Restrictions:  Insurance pre-authorization is required or let the patient know they may be charged for testing.

This test is for ongoing pregnancies only.

Specimen Requirements

Specimen - NOTE: This test is for ongoing pregnancies only.

     Villi
          - Minimum 20 mg
          - Optimal >30 mg

          - To add additional testing would require 10 mg per test, meaning >30 mg (if FISH requested with karyotype and CMA).
          - Place in transport media provided; store and transport at room temperature; DO NOT FREEZE; DO NOT PUT IN         FORMALIN. Do not send entire placenta to cytogenetics.
          - CMA testing on the direct specimen will depend on quality and quantity of available processed ("cleaned") villi.
          -JHH: Tube to station 072 or hand deliver to Cytogenetics Lab, Halsted 281.   
           Other Locations: Arrange courier deliver to JHH Core Laboratory (address below).   Call Lab for transport media when supply is low.

 LAB phone: 410-955-3476; specimens will be received M-F, between 8 am and 4:00 pm

     Amniotic Fluid
          - Minimum 20 mL
          - Optimal >30 mL

          - Note: Testing may be performed on direct amniotic fluid or cultured amniotic fluid, dependent on size and quality of cell pellet obtained. Typically 10-15 mL for testing on direct (GA >17 weeks) or cultured cells.  To add additional testing would require 10 ml of fluid per test (example >30 mls required, if FISH ordered with Karyotype and array).

          - Store and transport at room temperature - DO NOT FREEZE. 
          - Use multiple 15 mL centrifuge tubes or contact the lab for a sterile container.
          - CMA testing on the direct specimen will depend on size and quality of pellet.
          - Call for transport media or to arrange specimen delivery (tube to station 072, courier deliver or lab pick up). 

LAB phone:  410-955-3476; specimens will be received M-F, between 8am and 4:00pm

Specimen Types:  Chorionic Villi, Amniotic Fluid

Lab Notes: 

NOTE: This test is for ongoing pregnancies only.

Lab specimen shipping address:
     Johns Hopkins Cytogenomics/Cytogenetics Lab
     deliver to JHH Core Laboratory
     600 N Wolfe Street
     Baltimore, MD 21287

LAB phone:  410-955-3476; specimens will be received M-F, between 8am and 4:00pm

Results in EPIC under Lab Results
Downtime: Use the Prenatal Laboratory form