Ascension St. Agnes in Baltimore: Allergy Care on the West Side with Immediate and Long-Term Treatment

Ascension St. Agnes is a Catholic health system hospital on West Mulberry Street in west-central Baltimore that operates an allergy clinic staffed by board-certified allergists treating conditions from seasonal allergies to asthma and immunotherapy candidates. The clinic sits within a larger 235-bed acute-care facility, meaning allergy patients can access testing, specialist consultation, and coordinated follow-up without navigating between separate buildings.

What the allergy clinic actually does

The Ascension St. Agnes allergy practice diagnoses and manages allergic rhinitis, asthma, eczema, food allergies, urticaria, and drug sensitivities through skin testing, blood work, and pulmonary function testing when indicated. Allergists at the clinic prescribe immunotherapy (allergy shots or sublingual tablets), oversee biologics for moderate-to-severe asthma, and coordinate with primary care physicians and pulmonologists on shared patients. The clinic operates within the Ascension Health system, one of the nation's largest nonprofit health networks, which affects insurance negotiation, electronic health record integration, and referral patterns across Maryland.

Available testing and treatment

Initial allergy testing typically uses percutaneous skin testing (prick test), which yields results within 15 to 20 minutes and costs between $150 and $300 out-of-pocket at many Baltimore practices; specific-IgE blood testing (ImmunoCAP or RAST) adds $200 to $500 depending on the panel size and is often necessary for patients on antihistamines or those unable to discontinue them before skin testing. Immunotherapy shots begin at roughly $50 to $100 per injection after the build-up phase, which typically spans 3 to 6 months; annual costs for ongoing maintenance therapy range from $600 to $1,200 depending on allergen count and frequency. Sublingual tablets (Oralair for grass pollen, Ragwitek for ragweed) cost approximately $30 to $60 per month under many insurance plans but require year-round or pre-seasonal dosing. Biologic monoclonal antibodies (omalizumab, mepolizumab, reslizumab, dupilumab) for severe asthma or eczema run $2,000 to $5,000 per month before insurance; most require prior authorization and are dispensed through specialty pharmacies. Pricing varies by insurance plan and out-of-pocket maximums; confirm specifics directly with the clinic before scheduling testing.

How St. Agnes compares to other Baltimore allergists

Ascension St. Agnes and University of Maryland Medical Center are the two allergy practices in Baltimore most embedded in academic health systems, offering access to residents and research. University of Maryland's allergy clinic, located on the downtown medical campus, operates a teaching service where residents participate under supervision and typically maintains longer wait times (4 to 8 weeks for new patients) in exchange for lower-cost evaluation at a teaching hospital. Ascension St. Agnes, while part of a large system, operates primarily as a community hospital and typically schedules new patients within 2 to 4 weeks. Sinai Hospital's allergy service, on the north side near Pimlico, functions similarly to St. Agnes as a community-hospital-based clinic with comparable wait times. Private practices like those in Federal Hill or Canton often offer same-week appointments and more personalized scheduling but may not integrate as seamlessly with hospital-based testing infrastructure or coordinate as directly with pulmonology. Choose St. Agnes if you are already under Ascension care (including at Ascension partner urgent cares or primary practices) and value integrated records; choose University of Maryland if cost or resident involvement is a priority; choose a private practice if you need rapid availability and prefer continuity with a single allergist.

Who fits here and who does not

Ascension St. Agnes suits adults and older teens with seasonal or perennial allergies, asthma, or atopic dermatitis who have or are willing to enroll in an Ascension-affiliated primary care practice or insurance plan and who do not require pediatric-focused immunotherapy training (the clinic accepts children but is not pediatric-specialized). Patients on Medicaid, Medicare, or Ascension-aligned commercial plans typically experience lower out-of-pocket costs due to contract rates. Those without a referring primary care physician should be aware that many allergy clinics, including St. Agnes, operate on referral-based models; self-referral is sometimes available but not guaranteed. The clinic is poorly suited for uninsured patients seeking low-cost testing alternatives; community health centers like Bon Secours Healthcare and federally qualified health centers often offer skin testing at reduced fees on a sliding scale. It is also not the right fit for patients seeking cutting-edge experimental biologics or rare-allergen immunotherapy beyond the standard mold and dust-mite panels, as hospital-based clinics typically stock the most common formulations.

What your first appointment involves

Book an initial allergy visit by calling the Ascension St. Agnes appointment line or requesting a referral through your primary care physician. Bring insurance cards, identification, photo ID, and a list of current medications including antihistamines, corticosteroids, and beta-blockers (which can interfere with skin testing). The allergist will review your symptom history, triggers, prior testing, and family history, typically a 20-30 minute clinical interview. Skin testing follows immediately if no contraindications exist: the allergist or nurse applies allergen extract to small punctures on the forearm or back and observes for wheal reactions after 15 minutes. If you have taken antihistamines within 5 to 7 days, request blood testing instead (results available in 1 to 2 weeks by phone or patient portal). The first visit usually concludes with a treatment plan, which may include over-the-counter medication recommendations, prescription intranasal corticosteroids, or scheduling for immunotherapy initiation.

Hours, location, and parking

Ascension St. Agnes allergy clinic operates Monday through Friday, 8 a.m. to 4:30 p.m., with limited or no Saturday availability; verify exact hours before scheduling as hospital clinic hours can shift seasonally. The clinic is located within the main hospital building at 900 West Mulberry Street in west Baltimore, near the intersection of Mulberry and Fremont. On-site parking is free and accessible from the hospital's main lot off Fremont Avenue. Public transit access is moderate: MTA bus lines 1, 3, and 13 serve the corridor, but walking distance from the nearest Metro station is not practical. Drive time from downtown Baltimore or the harbor is 12 to 18 minutes depending on traffic.

St. Agnes brings hospital-grade allergy testing and immunotherapy into west Baltimore's care network, reducing barriers for patients already embedded in the Ascension system or living west of downtown.