Interventional radiology (IR) and angiography suites are image-guided procedure rooms where physicians thread catheters, wires, and devices through the vasculature under live fluoroscopy to diagnose and treat disease without open surgery. Unlike diagnostic imaging rooms, these are invasive, sterile procedure environments — which pulls them out of the standard diagnostic-imaging classification and into the demanding overlap of an operating room and a fixed high-output X-ray lab, with consequences for HVAC, finishes, power resilience, structure, and shielding.

What an IR / angiography suite is — and how it differs from a diagnostic room

The defining distinction is that the patient's skin is broken and an invasive procedure is performed. That single fact reclassifies the room. Under the FGI Guidelines for Design and Construction of Hospital Facilities, an X-ray/fluoroscopy room used only for diagnostic exposures is an imaging room, but a room where invasive interventional procedures are performed is classified as an interventional imaging room (analogous to a Class 2 imaging-procedure environment) and, when the procedures are more complex or combined with surgery, it rises toward operating-room-grade requirements. The clinical work performed here drives the building science — not the imaging equipment alone.

The family of rooms in this Article's lane includes:

• Single-plane angiography / IR labs — one floor- or ceiling-mounted fixed C-arm; the workhorse room for peripheral angioplasty, embolization, drains, biopsies, ports, dialysis-access, and uterine fibroid or oncologic interventions.
• Biplane suites — two independent imaging chains (frontal and lateral) firing simultaneously, used for neuro-interventional work (aneurysm coiling, stroke thrombectomy, AVM embolization) and complex pediatric/cardiac cases where biplane reduces contrast load and procedure time.
• Cardiac catheterization (cath) and electrophysiology (EP) labs — closely related hemodynamic-monitored rooms for coronary angiography, PCI/stenting, structural-heart work, and ablations; functionally part of the same design family.
• Hybrid operating rooms — a fixed imaging system inside a full surgical OR, enabling TAVR, EVAR/TEVAR, and combined open-plus-endovascular procedures. The hybrid OR is the most stringent member of the family and is governed primarily by OR requirements with the angio system layered on top.

Adjacent Articles cover the purely diagnostic CT, X-ray, and fluoroscopy rooms, the MRI suite, and nuclear medicine separately; this Article stays in the invasive interventional and angiographic lane.

Governing codes, standards, and authorities

IR and angio suites sit at the intersection of the imaging code stack and the surgical/procedural code stack. Key governing references in the United States:

• FGI Guidelines — establishes the imaging-room vs. interventional-imaging-room classification, minimum clear floor areas, control-room and adjacent-support requirements, and the link between procedure type and room category. Most state health departments adopt FGI by reference.
• ASHRAE 170 / FGI Table — sets ventilation parameters by space type: air changes per hour, minimum outdoor air, pressure relationship, temperature, and humidity. Interventional and hybrid environments carry stricter values than diagnostic imaging rooms.
• NFPA 99 (Health Care Facilities Code) — risk-category-based requirements for medical gas/vacuum systems and electrical system reliability, including the wet-procedure-location determination that governs whether isolated power or GFCI protection is required.
• NFPA 110 — performance of emergency/standby power systems (generators) feeding the essential electrical system.
• NFPA 101 (Life Safety Code) / IBC — occupancy classification (these rooms typically fall under institutional/health-care occupancy and may invoke ambulatory-surgical or sedation provisions), egress, and smoke compartmentation.
• NFPA 70 (NEC), Article 517 — health-care-facility wiring: branch circuits, the essential electrical system (life-safety, critical, and equipment branches), and patient-care-space requirements.
• CMS Conditions of Participation and accreditation by TJC or DNV — operational/physical-environment compliance for Medicare-participating facilities.
• State radiation-control programs, NCRP reports, and a qualified medical physicist — govern shielding design and acceptance (covered in depth by the shielding sibling Article; the room design must reserve the wall, floor, and ceiling assemblies the physicist specifies).
• ADA / ABA accessibility standards — clear floor space, accessible transfer, and route requirements.