An Important Department Behind The Scenes

The Queen of the Valley medical laboratory is recognized as having a significant role in our delivery of quality patient care. Since medical laboratory professionals often work out of the public eye, few people know much about the critically important testing that the laboratory staff performs every day. It is estimated that approximately 85 percent of all physician decisions regarding diagnosis and treatment are based on laboratory test results.

Outpatient Laboratory Services

980 Trancas, Suite 11:
Monday – Friday: 7 a.m. - 1 p.m. (In response to COVID-19 and encourage social distancing, starting 3/17, On Monday, March 23, we will take appointments only.)
Phone Number (707) 257-4062 or (707) 257-4036 (to make an appointment)
Fax Number (707) 251-1861

St. Joseph Health Prompt Care:
River Park Shopping Center
1621 West Imola Ave, Napa, CA 94559
Phone: (707) 257-4036
Laboratory Hours of Operation:
(effective 3/17, lab services will temporarily not be offered at the Prompt Care location and will be preformed at 980 Trancas Street instead)

New Pre-Scheduled Outpatient Lab Appointments
In an effort to reduce wait time, we are pleased to announce patients will be able to schedule an appointment for lab services in advance of their visit. While patients are always welcome to walk into the lab without a pre-scheduled appointment, patients may find that booking in advance minimizes wait time and increases convenience.

Patients or physicians can schedule an appointment in advance by calling our Central Scheduling department at (707) 257-4036. Central Scheduling representatives will be available to schedule appointments during the following hours of operation:

  • Monday-Thursday from 8 a.m.-noon and 1 p.m.-5:30 p.m.
  • Friday from 8:00 a.m.-noon.

Additional Lab Information

(External links are not endorsed by Queen of the Valley Medical Center or the St. Joseph Health. They are for information purposes only.)

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