About Us
Overview
Established in 1979, the Johns Hopkins Genomics DNA Diagnostic Laboratory is a CLIA and CAP certified; Maryland, New York, and Pennsylvania licensed clinical genetics testing laboratory specializing in rare inherited disorders. Led by renown professor of pediatrics and medical genetics Dr. Garry R. Cutting, the lab offers testing for a range of approximately 50 phenotypes and disorders totaling 3,500 tests annually.
Techniques include:
- Exome/Zoom
- Next Generation Sequencing (NGS; sequence and deletion/duplication analysis)
- Sanger sequencing
- PCR/fragment analysis
In addition to its core mission, the Johns Hopkins Genomics DNA Diagnostic Laboratory is also proud to serve as the Cystic Fibrosis Foundation’s Mutation Analysis Program (MAP) Laboratory.
The lab's website is intended for the use of health care providers and we are not able to consult directly with patients. Health care providers and patients may find some helpful resources on our Patient and Family Resources page.
Lab Information
Contact Us
Phone & Fax
Billing: 667-306-8282
CFF Mutation Analysis Program: 410-614-2750
Fax: 410-367-3266
Location
Postal Address (not for shipping samples):
Johns Hopkins Genomics - DNA Diagnostic Laboratory 1812 Ashland Ave, Suite 200 Baltimore, MD 21205
Schedule
Hours of Operation
Monday-Friday 8:00AM to 4:30PM Eastern Time
Closed on weekends and holidays.
When the lab is closed, no personnel will be present to answer phone calls or accept specimen deliveries. Please plan specimen shipments accordingly.
Holiday Schedule
JHGDDL follows the Johns Hopkins University holiday calendar, including:
- New Year's Day
- Martin Luther King, Jr. Day
- Memorial Day
- Juneteenth
- Independence Day
- Labor Day
- Thanksgiving Day
- Day after Thanksgiving
- Winter Holiday (Tuesday, December 24 - Tuesday, December 31)
Helpful Links & Resources
Laboratories in the Division of Molecular Pathology
Cytogenetics/Cytogenomics Laboratory: Cancer, Prenatal, Postnatal, and Core Facility teams offering karyotype analysis, SNP microarray analysis, fluorescence in-situ hybridization (FISH).
Department of Genetic Medicine Clinics
Lab Staff
Garry R. Cutting, M.D.
Medical Laboratory Director, Professor of Genetic Medicine
Dr. Cutting earned his B.S. in Biology from the University of Connecticut and his M.D. from the University of Connecticut Medical School. He completed a fellowship in Pediatric Genetics at the Johns Hopkins University School of Medicine. His research is focused on the genetic and non-genetic causes of disease variation in cystic fibrosis (CF) and there are three major active projects in his research laboratory: CF Twin and Sibling Study, Genetic Heterogeneity in CF, CFTR2 Project.
The CF Twin and Sibling Study seeks to identify the major genetic and environmental factors that cause variation in the CF phenotype. Genome-wide linkage and association methods are employed to find loci and genes that modify quantitative traits (lung function, BMI) and qualitative complications (diabetes and meconium ileus) of CF. The Genetic Heterogeneity study is investigating families recruited by the laboratory that have 2 or more individuals where linkage excludes involvement of CFTR. Exome sequencing is being used to discover new genes that create a CF-like phenotype. CFTR2 is a worldwide project involving ~70,000 CF patients to clinical and functionally annotate all mutations in the CFTR gene.
Molly B. Sheridan, Ph.D.
Laboratory Director, Assistant Professor of Genetic Medicine
Dr. Sheridan earned a B.S. in Biology from The College of New Jersey and a Ph.D. in Cellular and Molecular Medicine from Johns Hopkins University. She completed a research post-doctoral fellowship in genetics at Children’s Hospital of Philadelphia in 2011. Dr. Sheridan returned to Johns Hopkins University in 2011 to complete a combined Clinical Cytogenetics and Clinical Molecular Genetics fellowship. She joined the McKusick-Nathans Institute of Genetic Medicine faculty in 2015. She is board-certified by the American Board of Medical Genetics and Genomics in Clinical Cytogenetics and Clinical Molecular Genetics.
Sabrina Ingram, B.S.
Billing Coordinator
Sabrina’s role within the lab is to coordinate the billing. She is responsible for making sure the billing process is easy and simple for the referrers requesting testing. She also plays a role in the financial aspects of the JHGDDL, such as Budget Reports, Reimbursements and AP/AR. After relocating to Baltimore, Sabrina obtained a degree in Business Administration from Sojourner-Douglass College in Baltimore, Maryland. She has worked for Johns Hopkins University for more than 12 years and enjoys working with clients and the laboratory technical staff.
Technical Staff
Miller Barksdale, B.S., Molecular Diagnostics Technologist
Krista D'Adamo, B.S., Lead Molecular Diagnostics Technologist
Emily Ferg, B.S., Clinical Laboratory Specialist
Lisa Fleet, B.S., M.S., Molecular Diagnostics Technologist
Krystine Foster, B.S., Molecular Diagnostics Technologist
Hannah Shultz-Lutwyche, B.S., Genetic Counselor Assistant
Certifications & Permits
- CLIA Certification: #21D0692357 (exp 08/7/2025)
- CAP Accreditation: #1353017 (exp 06/30/2025)
- MD State Permit: #557 Non-Expiring
- NY State Permit: #4253 (exp 06/30/2025)
- PA State Permit: #029028A (exp 08/15/2025)
Proficiency Testing: Participant in CAP Surveys, Inter- and Intra-laboratory comparison challenges.