Healthcare 10 min read

Five systems, five different questions.

Nurse call, personal alarms, CCTV, access control and indoor location get compared as if they compete. They do not. Each answers one question well and the others badly — and knowing which is which is most of the buying decision.

By Frank Guo · Technology & Product Leadership, addanode

TL;DR — Nurse call answers "someone in this room wants help" and nothing else — it knows a room, not a person, and cannot tell you who responded or how long it took. Personal alarms answer "this individual pressed a button", but a consumer pendant assumes an off-site monitoring centre and a fixed address. CCTV answers "what happened here", after the fact and only where a camera points. Access control answers "who was permitted through this door" — a permission record, not a presence record. Indoor location answers "where is this person or thing now, and how long did the response take" — the one question the other four cannot reach. The right facility buys two or three of these deliberately. The wrong one buys whichever the last salesperson was selling.

The comparison on one table

The column worth dwelling on is the one about what each system cannot answer. That is what determines whether a single system will do or whether you are, in practice, buying two — and it is the part that gets discovered after installation when it is not read beforehand. A system that answers “someone in room 12 needs help” and one that answers “where is this person now” are not better or worse versions of each other; they fail in different places, and the gap between them is where the incident you are worried about tends to sit.

System	The question it answers	What it cannot tell you	Best used for
Nurse call	Someone in this room wants help	Who responded, whether they arrived, how long it took, or calls from outside a wired room	The primary summoning layer — keep it
Personal alarm / pendant	This individual pressed a button	Where they are, if the product assumes a fixed home address	Independent living at home, with a monitored response
CCTV	What happened at this spot	Anything outside frame; and nobody is watching live at 02:40	After-the-fact review at defined points
Access control	Who was permitted through this door	Who actually went through, who tailgated, where they went next	Restricting entry; a permission record
Indoor location	Where is this person or item now; how long did the response take	Why it happened, or what it looked like	Response evidence, duress, egress safety, finding equipment
RFID checkpoints	Did this item pass this point	Where it is between points	Linen, stores, counting at handovers

Nurse call: what it was designed to do, and what it was not

A nurse call system is a summoning device. A resident presses, a light comes on, a buzzer sounds, somebody goes. It does this reliably and cheaply and there is no reason to remove it — the mistake is expecting it to produce a record.

Three specific limits are worth naming, because facilities usually discover them at an inquiry rather than at procurement. It knows a room, not a person — a resident who falls in the corridor is outside the system entirely. It records a cancellation, not an arrival — the light goes out when somebody presses the reset at the wall, which may be a carer who has attended, or a carer passing by who silenced a noise. And it has no concept of time: nothing in the architecture measures the interval between the call and the response, so "we answer calls promptly" stays an assertion.

None of this makes nurse call obsolete. It makes it the first layer of a system that needs a second one.

Where indoor location adds what the others cannot

The useful way to think about indoor location is not as an alternative to any of these. It is as the layer that adds who and when to systems that currently know only where or what:

Added to nurse call: route the call to the nearest available carer instead of broadcasting; record arrival by presence in the room rather than by cancellation at the wall; produce call-to-arrival time per event, reportable by ward, shift and hour.
Added to access control: access control says a badge was presented at a door. Location says the person is now in the plant room, and is still there ninety minutes later. In an evacuation that is the difference between a permission log and a muster list.
Added to CCTV: a location event tells you which camera to open and at what timestamp, which turns hours of review into seconds. This is the pairing most facilities underrate.
On its own, for duress: a wearable button that carries the wearer's position is the only one of these that helps a staff member who is not next to a wall.
On its own, for egress: a resident leaving through a monitored boundary raises an alarm with nobody pressing anything — the case where every button-based system is silent by design.

The table above, read backwards. Start from the sentence you need the system to produce, not from the product category — each of these five answers one question well and the other four badly.

The technologies underneath indoor location

If you do go down this road you will meet the vocabulary: what we have been calling indoor location is sold as an indoor positioning system or a real-time location system (RTLS). The terms are interchangeable in practice, and worth knowing mainly so you can read a proposal — no facility manager we have met started their search with the word RTLS. Underneath the label you will be offered several radio technologies, and the differences that matter commercially are fewer than the datasheets suggest.

Approach	How it decides position	Practical resolution	Trade-off
Ultra-wideband (UWB)	Times a radio pulse's flight between tag and reference point	Room and door level dependably; tighter under line of sight	More infrastructure than beacons; the accuracy is real rather than inferred
Bluetooth beacons	Infers distance from received signal strength	Zone level; unstable near metal, bodies and doors	Cheap per point, and signal strength is a poor proxy for distance
Wi-Fi positioning	Uses existing access points and signal strength	Coarse zone level, varies with network changes	Looks free because the network exists; accuracy moves whenever IT does
Infrared	Line-of-sight beam per room	Certain room-level containment	Blocked by anything opaque, including a pocket
GPS	Satellite	Outdoors only; unusable inside a building	Solves the wrong problem for a facility

We deploy UWB, and the reason is narrower than "it is more accurate". Signal-strength methods infer distance from how loud a signal seems, which changes when a trolley moves, a door closes or a person stands in the way. Timing a pulse measures something physical instead. For "did a carer enter room 12 or walk past it", that distinction is the whole answer. What we do not claim is centimetre performance in an occupied ward — manufacturer figures are line-of-sight, and the honest planning target is room and door certainty, which is what these use cases actually need.

The question that decides your scope

Before comparing any of this, write down the sentence you want the system to be able to produce, then read it back:

"Someone in flat 14 is calling" → you already have nurse call. Nothing to buy.
"A carer attended flat 14 at 02:14, four minutes after the call" → nurse call plus presence-level location.
"Mrs D left through the garden gate at 02:40, alone" → boundary-level location. No button will ever produce this.
"Sister N pressed for help and she is in the east corridor" → wearable duress with location.
"The third infusion pump is in ward 3" → presence-level location on equipment, or RFID checkpoints if passing a point is enough.
"Here is what the incident looked like" → CCTV, cued by a location event so you are not scrubbing footage.

Most facilities need two or three of these, and the honest scope is smaller than the first proposal they receive. Our scenario map takes this further, area by area, including the two places where location is the wrong tool entirely.

Three buying traps

Buying resolution you cannot use. Centimetre accuracy sounds better than room accuracy and costs considerably more in reference points. If your sentence does not contain a position inside a room, you are paying for precision nobody will read — and under POPIA's minimality condition you are also collecting more personal information than your purpose justifies.
Buying a replacement when you needed a layer. Ripping out a working nurse call system to install location is rarely necessary; the two are complementary and a good design keeps existing call points, pull cords and door contacts feeding the same event log.
Buying on the demo. These systems work in an empty room and are tested by an occupied one. Ask for a first area proven live against acceptance criteria agreed before installation, rather than a kit on a table.

Where to next: nurse call system prices for what each class actually costs to buy, nurse call and staff safety for how a project runs, POPIA and location tracking for the compliance design, and panic buttons and fall detection for the wearable layer.

FAQ

Choosing between systems — common questions

Should we replace our nurse call system with a location system?

Almost never. They answer different questions and work better together: nurse call is a reliable, cheap summoning layer, and location adds the things it structurally cannot provide — routing to the nearest available carer, arrival recorded by presence rather than by someone cancelling a light at the wall, and a call-to-arrival time for every event. A good design keeps existing call points, pull cords and door contacts feeding the same event log. Replacement only makes sense when the call system is at end of life anyway, and even then it is a budget decision rather than a technical necessity.

Is CCTV not cheaper than a location system?

Per camera it is, but it answers a different question and only at the spot the camera points. CCTV tells you what happened after the fact; it does not alert anyone at 02:40, it does not cover the corridor you did not put a camera in, and reviewing it means someone scrubbing footage. The pairing most facilities underrate is using both: a location event tells you which camera to open and at which timestamp, turning hours of review into seconds. In a care setting, cameras also raise privacy questions in resident areas that a room-presence record does not.

We already have access control — is that not the same thing?

No, and the difference matters most in the moments that count. Access control records that a credential was presented at a door and permission granted. It cannot tell you who actually walked through, who followed behind them, or where anyone went next. That means it produces a permission log, not a presence record — so in an evacuation it cannot give you a muster list, and after an incident it cannot tell you who was in the area. Location adds the presence layer on top of the permissions you already enforce.

Why UWB rather than Bluetooth beacons or Wi-Fi?

Because of what each one actually measures. Bluetooth and Wi-Fi methods infer distance from how strong a signal appears, and signal strength changes when a trolley moves, a door closes or a person stands between the tag and the receiver — so the position wanders even when nothing has. Ultra-wideband times how long a radio pulse takes to travel, which is a physical measurement rather than an inference. For the question "did a carer enter room 12 or walk past it", that distinction decides whether your record is trustworthy or merely plausible.

How accurate does a facility system actually need to be?

Less accurate than most proposals assume, and that is good news for the budget. Ask what sentence you need the system to produce. "A carer attended room 12 at 02:14" needs certainty about which room — not where in the room. "The resident crossed the garden gate at 02:40" needs certainty about a boundary. Only genuinely open spaces, such as an emergency unit where a responder needs a place rather than a zone, justify full area coverage. Buying finer resolution than your purpose needs costs more and, under POPIA's minimality condition, collects more personal information than you can justify.

Can one system cover both people and equipment?

Yes, and it is usually the sensible way to phase a project. The same reference points serve staff badges, resident wearables and asset tags — only the tag differs, with long-life sealed tags on equipment and comfortable wearables on people. Facilities often start with equipment precisely because it pays back quickly and touches no personal information at all, then extend to staff duress and response evidence once the infrastructure is proven in the building. For items where knowing that something passed a point is sufficient, RFID checkpoints remain cheaper than continuous location.

How should we evaluate suppliers?

Ask for a first area proven live rather than a demo on a table — these systems work in an empty room and are tested by an occupied one. Agree the acceptance criteria before installation, in your words: which room, which boundary, how quickly, how reliably. Then ask three questions that separate serious suppliers: do you get documented access to your own event data, where does the processing physically happen, and what happens to the system during a power outage. A supplier who cannot answer all three in writing is selling you a demonstration rather than a system.

Write the sentence. Then buy the system.

Tell us what you need to be able to say, and we will tell you which of these layers you actually need — including where the answer is "you already have it".

Book a Site Survey The scenario map →