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Information for Referrers within Johns Hopkins

Please visit the Available Tests page to see our test selection.

Download Diagnostic Lab requisition form

Download Path 3 requisition form

View current DNA Diagnostic Lab test codes

General Information
  • DNA Diagnostic Lab (DDL) tests can be ordered on the Johns Hopkins Path 3 form.
  • The general sample requirement is 6ml whole blood in lavender top (EDTA tubes, but see our Sample Requirements for additional guidance. 
  • Be sure to include the patient's ID#, the referrer's Hospital ID#, and the location ID# on the form. 
  • To provide additional information, please complete a DDL requisition form (you do not need to include billing information if drawn on campus) and fax it to 410-955-0484 or send it along with the sample attached to the Path 3 form.
  • DDL tests are ordered by Pathology test code (Download a list of DDL Test Codes) .  Add the desired test code(s) to the Miscellaneous Procedure section of the form (bottom right).
  • If you need targeted testing for a known mutation or prenatal testing, please contact the lab directly to coordinate (410-955-0483)
  • Have the sample drawn in your area and taken to the Core Lab or have the patient report to Express Testing with the completed requisitions.  Express Testing and the Core Lab will route the sample to the DDL.
  • If a sample is processed through the Core Lab, the DNA Diagnostic Lab is not involved in billing.  
  • The prices provided on our web site apply to outside referrals and do not necessarily reflect what your patient will be charged.  If a sample is drawn in 'regulated space', Maryland law regulates the fees charged for laboratory services based on CPT codes, relative value units (RVUs), and the current RVU reimbursement rate.  Neither the DNA Diagnostic Lab nor the Department of Pathology control the assigned RVUs or RVU rates.  Please contact Pathology Customer Service (5-1921) to find out the current fee for a test.      

If the patient is uninsured, has a non-contracted insurance plan, or will be paying out of pocket for any other reason:    

  • Have the patient sample drawn in non-regulated space to minimize out-of-pocket expense 
  • Contact the DDL for pricing information: 410-955-0483
  • Include credit card information or a check made out to Johns Hopkins University with the completed requisition form.
Non-Regulated Draw Sites
East Baltimore Medical Center 
1000 East Eager St., Suite 1001


Johns Hopkins Medical Laboratory 
Greenspring Station 
10753 Falls Road, Suite 105
Johns Hopkins Medical Laboratory
White Marsh
4924 Campbell Blvd.; Suite 115
Johns Hopkins Medical Laboratory
1132 Annapolis Rd; Suite 102

Medical Pavilion at Howard County
10710 Charter Dr; Suite G040
Johns Hopkins Medical Laboratory Highlandtown (Baltimore Medical System Healthy Living Center)
3700 Fleet Street

Wyman Park Medical Center
3100 Wyman Park Drive, Suite 170A