hospital-cad

name	hospital-cad
description	Room standards, zoning, adjacency, and special medical requirements for hospital and healthcare facility layouts — hospital, clinic, medical center, healthcare facility, ICU, OPD, operating theatre, OT, ward, nursing home, dispensary, health post, polyclinic, emergency room, ER, trauma center, maternity ward, NICU, CSSD, diagnostic center, pathology lab, radiology, MRI suite, CT scan room, blood bank, pharmacy, ambulance bay. ALWAYS use this skill for any healthcare or medical building design.
version	1.0
composable_with	["cad-core"]

Hospital Layout Skill

Hospital layouts require strict infection control zoning, wide corridors for stretcher/wheelchair movement, specialized room requirements (OT sterile zones, MRI shielding, CSSD unidirectional flow), and compliance with NBC and NABH standards. Clearance between zones is 200mm (not 150mm).

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REFERENCES TO LOAD

• Always load: references/room_standards.md — minimum sizes for all hospital zones
• Always load: references/room_adjacency.md — required spatial relationships
• Load for OT/CSSD/MRI: references/special_requirements.md — sterile corridors, RF shielding, unidirectional flow
• Load for worked example: references/example_layout.json — complete hospital ground floor

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DOMAIN-SPECIFIC RULES

RULE H1 — Wall thickness and clearance. Hospital wall_thickness = 200mm. Clearance between zones = 200mm.

RULE H2 — Corridor width. ALL corridors MUST be minimum 2400mm wide for stretcher and wheelchair passage.

RULE H3 — OT sterile corridor. Operating theatres MUST be accessed through a separate sterile corridor room:

• Width: 2000mm minimum
• Doors: empty array [] (open passage, no physical doors)
• The sterile corridor connects to OT rooms and scrub stations only

RULE H4 — Scrub station rule. Scrub stations MUST have doors: [] (empty — they are open wet zones with no physical door). Add a note: "open wet zone, no physical door".

RULE H5 — CSSD dual corridor. NEVER model CSSD as a single room. CSSD requires TWO separate rooms:

• "CSSD Dirty Corridor" — receives contaminated instruments
• "CSSD Clean Corridor" — dispatches sterilized instruments
• These two rooms MUST NOT be adjacent. Place them on opposite sides of the sterilization zone with processing rooms between them.

RULE H6 — MRI quench pipe annotation. MRI rooms MUST include annotation metadata:

• RF shielding: copper Faraday cage required
• Quench pipe: 250mm diameter, routed to exterior above roof level
• 5-gauss line: extends ~3m from magnet center — no ferromagnetic objects within

RULE H7 — Clean/dirty utility separation. Clean utility and dirty utility rooms MUST be on OPPOSITE sides of the nursing station. NEVER place them adjacent to each other. This prevents cross-contamination.

RULE H8 — ICU security. ICU MUST have controlled access — a single entry point with a security door. Double-leaf doors minimum 1500mm for gurney access.

RULE H9 — Emergency room access. Emergency room MUST be accessible from BOTH the main entrance AND a separate ambulance entry point. It needs at least 2 doors on different walls.

RULE H10 — Patient flow. Reception → Waiting Area → OPD/Consultation. This flow MUST be linear — patients should not need to backtrack through clinical areas.

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UNKNOWN ROOM HANDLING

If the user requests a medical space not in room_standards (e.g., "dialysis unit", "PET-CT room"), estimate using domain knowledge:

• Dialysis unit: similar to ward (6000×6000)
• PET-CT: similar to X-ray room (4000×5000) with additional shielding note
• Set estimated: true, add to flagged_estimated_rooms

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CODE COMPLIANCE REFERENCES

FGI Guidelines (Facility Guidelines Institute):

• Operating Room: min 37m² (400 SF) clear floor area, excluding fixed cabinets
• ICU bed bay: min 11.1m² (120 SF) clear floor area per patient
• Pre-op/PACU bay: min 7.4m² (80 SF) per patient
• Corridor width: 2440mm (8ft) for patient transport corridors
• Staff-only corridors: 1830mm (6ft) minimum

NABH (National Accreditation Board for Hospitals - India):

• OT: minimum 6m × 6m clear area with laminar flow zone
• ICU: minimum 12m² per bed with 1.5m between bed centers
• Nursing station: within 9m of farthest patient bed
• Clean/dirty utility: separate rooms on opposite sides of nursing station

Infection Control Zoning:

• Pressure hierarchy: OT (positive) > Corridors (neutral) > Dirty utility (negative)
• Surgical suite: progressive zones — unrestricted → semi-restricted → restricted
• No direct connection between unrestricted and restricted zones

IBC — Healthcare (I-2):

• Occupant load factor: 240 gross SF per person (hospital)
• Max travel distance: 150ft (46m) sprinklered I-2 occupancy
• Smoke compartments: max 2,090m² (22,500 SF) per compartment
• Defend-in-place strategy: patients cannot self-evacuate

ADA/ANSI A117.1 — Healthcare:

• All patient corridors: 2440mm min for stretcher + wheelchair passing
• Patient toilet rooms: 1525mm (60") turning circle
• Accessible exam rooms: min 10% of each type
• Gurney-accessible doors: 1067mm (42") minimum

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LAYOUT PRINCIPLES

1. Reception and waiting area at the main entrance
2. OPD consultation rooms near waiting area for patient flow
3. Emergency room accessible from main entrance AND ambulance entry
4. ICU near operation theatre and nursing station, within 46m travel distance
5. Pharmacy near OPD and waiting area for convenience
6. Diagnostic lab and X-ray near OPD
7. Admin office away from patient areas
8. Restrooms at regular intervals, one set per patient zone
9. Wet zones (restrooms, labs) clustered for plumbing efficiency
10. Smoke compartments: max 2,090m² per fire zone
11. Clean utility and dirty utility on OPPOSITE sides of nursing station
12. Pressure zones: OT positive, corridors neutral, dirty utility negative