# Dialysis Unit Design and Patient Flow > Dialysis unit design and patient flow for Dialysis Technology: clean-soiled zoning, isolation room, water plant siting, BMW segregation and NABH planning. - Canonical URL: https://prepelephant.com/topics/allied/dialysis-technology/dialysis-unit-design-flow - Exam / course: Allied Health · Subject: Dialysis Technology - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Dialysis Unit Design and Patient Flow", PrepElephant, https://prepelephant.com/topics/allied/dialysis-technology/dialysis-unit-design-flow ## Direct answer A dialysis unit is designed around one principle: patients, staff and consumables move from clean to soiled without ever crossing back. The entrance leads to weighing and triage and then to the dialysis hall; clean supplies enter through a clean corridor and leave as bio-medical waste through a separate soiled route; the reverse-osmosis plant sits close by with its circulating loop; an isolation room with a dedicated machine serves hepatitis B surface antigen-positive patients; and support spaces — reprocessing room, clean and soiled stores, staff changing and staff room — complete the plan. Indian units — NABH-accredited centres or Pradhan Mantri National Dialysis Programme district units — additionally plan machine counts to district load, power backup and dedicated plumbing. ## What you must remember - **Flow direction to recite:** patient entry → weighing/triage → dialysis stations → exit; consumables → clean store → treatment area; used items → soiled utility → bio-medical waste storage — routes that never intersect. - **Station planning:** each station commonly planned at roughly 2.5 × 3 metres with 1.5-2 metres between beds (state norms vary), with machine, chair, nearby hand hygiene and oxygen-suction provision per station or bay. - **Isolation room:** separate room with dedicated machine, equipment and supplies for HBsAg-positive patients, ideally its own entrance; hospitals commonly add serology-based segregation for HCV and HIV per policy. - **Water plant room:** houses multimedia filter, softener, carbon tanks, RO membranes and the storage-and-loop; sited adjacent to the hall to shorten the loop, with floor drains, ventilation and chemical storage safety. - **Reprocessing room:** separate, ventilated area for dialyser reuse with PPE and eye wash, sited away from clean zones. - **Surfaces and finishes:** seamless washable floors with coving and washable walls, disinfectable between shifts — a NABH expectation. - **Bio-medical waste:** segregation at source per BMW Rules 2016 — yellow for contaminated plastics, red for recyclables, white puncture-proof sharps containers, blue for glass — with a designated interim storage room. ## Designing a ten-bed district unit Sketch a PMNDP-style unit in a district hospital. The public entrance opens on a weighing area and a small waiting verandah; patients pass a triage desk checking vitals, serology status and session records before entering the hall. The hall holds ten stations in two rows, each about 2.5 × 3 metres, with the nurse station central and an unobstructed view of every chair. On one flank, the isolation room with its own machine and entrance serves HBsAg-positive patients; on the other, the clean store receives consumables from a corridor that never carries waste. At the rear sit the reprocessing room and, beyond it, the RO plant feeding the ceiling loop. Follow the day through the plan: the morning chlorine test at the plant, trolleys leaving the clean store in one direction, and yellow- and red-bagged waste leaving through the soiled corridor to the interim BMW room. The design is judged when something goes wrong: a crash needs the trolley within seconds, a leak needs floor drains, a power cut needs the generator to carry the plant and the running machines — which is why planning questions in DT papers are really infection-control and safety questions in architectural clothing. ## How the exam frames it Two question shapes recur. "Arrange in order" — the sequence of zones from entrance to soiled exit, or the correct placement of the RO plant, reprocessing room and isolation room relative to the treatment hall. "Spot the error" — a described plan where the clean store adjoins the soiled utility, the isolation room opens on the main hall, or the loop has a dead leg: each maps to a named principle (unidirectional flow, dedicated isolation, continuous circulation). Indian-programme framing asks how PMNDP district units scale — machines to district demand, PPP staffing, free-to-patient services — while accreditation framing invokes NABH standards for finishes, waste handling and documentation. The viva line that always scores: design is infection control built in concrete, not added by protocol. ## Frequently asked questions ### What is the core principle governing dialysis unit layout? Unidirectional clean-to-soiled flow — patients, staff and clean consumables move along routes that never cross the paths of soiled items and bio-medical waste. ### How is the isolation requirement for hepatitis B-positive patients met in unit design? A separate isolation room with a dedicated machine, equipment and supplies, preferably a separate entrance, planned so these patients never dialyse beside susceptible ones. ### Where is the water treatment plant sited and why? Adjacent to the dialysis hall to keep the distribution loop short, in a room with floor drains, ventilation and safe chemical storage feeding a continuously circulating loop. ### How is bio-medical waste managed in the unit plan? Segregation at source into colour-coded categories per BMW Rules 2016 — yellow, red, white sharps containers and blue — carried by a soiled route to an interim storage room. ### What engineering redundancies must a dialysis unit plan for? Backup power for machines and the RO plant, central oxygen and suction, functional floor drains, emergency exits and a crash trolley within rapid reach of every station.