Outpatient Laboratories

The Outpatient Laboratories of Texas Children’s Hospital provide specimen collection services for patients at the Medical Center, West Campus, Woodlands and North Austin campuses. These services are provided to registered patients of Texas Children’s Hospital.

Outpatient lab specimen collections for Texas Children’s Hospital Laboratories & Quest Diagnostics. No appointment necessary.

Patient Preparation for Lab Testing

Patients can help to ensure that their lab tests are accurate by following pre-testing instructions carefully. Patients should alert specimen collection personnel of any deviations from pre-testing instructions given by the healthcare provider. Specimen collection may be deferred if a patient is not adequately prepared for a test.

Please read the General Laboratory Glucose Tolerance Testing in Pregnancy guide for more information about this test.

Test Results

Test results are sent directly from the laboratory to the health care provider. Please allow at least 48-72 hours for tests results to be received and reviewed. Some lab tests may require additional time to complete. For questions or concerns about test results, please contact your health care provider.


For questions or concerns regarding an invoice for laboratory services, please contact the appropriate billing department or billing representative:

Quest Diagnostics:

Quest Diagnostics Billing Department

1 (866)846-4021

Texas Children’s Hospital:

Patient Accounting Department

Customer Service

(832) 824-2300 or (800) 722-2570

  • 3rd Floor, Room: D320.10
  • 6701 Fannin Street, Houston, TX 77030
  • Phone: 832-822-3044
  • Hours: Monday - Friday: 8:00 a.m. – 5:30 p.m.

  • Basement Level 1, Room: B.B100.01
  • 6621 Fannin Street, Houston, TX 77030
  • Phone: 832-824-5152
  • Hours: Open 24 hours a day, 7 days a week
  • New patients visiting between the hours of 5:30 p.m. and 8:00 a.m. must be registered by Patient Access in the Emergency Center prior to coming to the lab.
  • Sweat Chloride Testing for Cystic Fibrosis
    • Please have your physician contact the laboratory at 832-824-5152 to schedule testing.

  • 4th Floor, Suite F0450
  • 6651 S. Main Street, Houston, TX 77030
  • Phone: 832-826-7400
  • Hours: Monday - Friday: 7:00 a.m. - 5:00 p.m.
  • Saturday & Sunday: 7:00 a.m. - 12:00 p.m.
  • Open 365 days a year

  • 18200 Katy Freeway, Suite WB115, Houston, TX 77094
  • Phone: 832-227-1700
  • Hours: Monday - Friday: 7:00 a.m. - 5:00 p.m.
  • Newborns with orders for Bilirubin test orders may present to Pathology M-F 7:00 a.m. - 5:00 p.m. After hours, these patients may present to the Emergency room to register for an Outpatient Laboratory visit.

  • 17600 I-45 South, Suite WL0270, The Woodlands, TX 77384
  • Phone: 936-267-5200
  • Hours: Monday - Friday: 7:30 a.m. - 6:00 p.m.
  • Patients visiting between the hours of 6:00p and 7:30a must be registered in the Emergency Center prior to coming to the lab.

  • 1st floor Laboratory, Suite PA.0180.20
  • 9835 North Lake Creek Parkway, Austin TX 78717
  • Phone: 737-229-2203
  • Hours of Operation: Monday - Friday 7:00 a.m. - 6:00 p.m.
  • For Emergent blood lab collections after hours (i.e. neonatal bili) patients may present to the Emergency Center Registrar (ASR) to register for outpatient labs. Once registered, proceed to outpatient lab and ring bell for assistance.