What Is Biomedical Equipment Calibration and Why Does It Matter for Singapore Hospitals?

When a medical device gives a reading, you need to know it’s reliable. This is where medical equipment calibration in Singapore comes in. Calibration checks whether an instrument measures within an acceptable range by comparing its readings against a known reference standard.

For hospitals, clinics, nursing homes and other healthcare facilities, regular calibration helps you identify measurement drift before it affects patient care, equipment performance or quality records. It also gives your biomedical engineering team documented evidence that equipment continues to perform as expected.

What Is Biomedical Equipment Calibration?

Comparing equipment against a known standard

Biomedical equipment calibration involves comparing a device’s readings or output with a reference standard with a known level of accuracy. The calibration process shows whether the equipment stays within its specified tolerance.

For example, a biomedical tester may verify that a defibrillator delivers the expected energy output. In contrast, a flow analyser may verify that a medical gas or respiratory device delivers the expected flow.

Calibration doesn’t necessarily mean adjusting the equipment. If the readings fall within the required tolerance, the equipment may pass the calibration check. If it falls outside the acceptable range, your team may need to adjust, repair or remove the equipment from service.

Calibration vs servicing vs repair

These terms often get used together, but they serve different purposes:

• Calibration checks the accuracy of measurements against a recognised reference standard.
• Servicing involves planned maintenance to keep equipment operating properly. This can include inspections, cleaning, component checks and other routine tasks.
• Repair addresses a fault or failure that stops equipment from working as intended.

A device can therefore receive servicing without calibration, or calibration without repair. Your maintenance programme should define which activities each piece of equipment requires.

Which equipment requires calibration?

The need for calibration depends on the equipment, its intended use, the manufacturer’s requirements, and your facility’s quality procedures. Common examples include:

• Patient monitors and vital signs equipment
• Defibrillators and patient simulators
• Infusion pumps
• Electrosurgical unit (ESU) equipment
• Electrical safety testers
• Medical gas and respiratory flow analysers
• Other test and measurement instruments used to verify medical equipment

Why Calibration Is Not Optional in a Healthcare Setting

The patient safety case

A measurement error can have real consequences in a clinical setting. If a device consistently reports an inaccurate value, a healthcare professional may make a decision based on incorrect information.

Calibration helps your team detect measurement drift and confirm that equipment continues to perform within its required limits. It forms one part of a wider equipment safety and maintenance programme.

Regulatory and accreditation considerations in Singapore

Singapore healthcare facilities operate within a broader framework of quality, safety and risk management requirements. The exact calibration requirements depend on the equipment, its intended use, the manufacturer’s instructions, and the facility’s own policies and accreditation framework.

The Singapore Accreditation Council (SAC) recognises testing and calibration laboratories under the SAC-SINGLAS scheme. The scheme assesses laboratories’ technical competence and management processes against ISO/IEC 17025, with accreditation granted for specific tests and calibration activities.

For facilities that work with accreditation frameworks such as Joint Commission International (JCI), equipment inspection, testing and maintenance also form part of the organisation’s quality and safety responsibilities.

What happens when equipment drifts out of tolerance?

The risk goes beyond an inaccurate reading. If your team cannot demonstrate that a measurement instrument was properly checked, you may also have difficulty showing that your equipment management process worked as intended.

For this reason, calibration records should form part of your equipment history. If a device fails calibration, your team should assess its previous use and determine whether further action is necessary.

How Often Should Medical Equipment Be Calibrated?

Start with OEM recommendations

There isn’t one universal calibration interval for every medical device. Start with the original equipment manufacturer’s recommendations and any applicable requirements for the equipment.

Your facility may then set its own schedule based on risk, usage and past performance.

Consider how the equipment is used

Calibration frequency can depend on:

• How often the equipment is used
• How heavily the equipment is used
• The operating environment
• The age and condition of the equipment
• Previous calibration results
• Whether the equipment has undergone repair or adjustment
• The consequences of an inaccurate measurement

A heavily used instrument in a critical application may need closer monitoring than a device used less frequently.

Build a clear calibration schedule

A central equipment register can help your biomedical engineering team track calibration due dates, certificates, equipment status and previous results.

You can also flag equipment approaching its calibration date so your team can arrange the service before the device becomes overdue.

What Happens During a Calibration?

1. Pre-calibration inspection

The technician first checks the equipment’s condition and identifies any visible damage or issues that could affect the calibration. The equipment details, such as model and serial number, should also be recorded.

2. Measurement and adjustment

The technician then uses suitable reference equipment to compare the device’s readings against known values.

If the equipment falls outside its required tolerance, the technician may adjust or repair it where the applicable procedure allows. The equipment should then undergo the necessary checks again.

3. Calibration certificate and traceability

Once calibration is complete, you should receive documentation showing what the technician tested and the results obtained.

A useful calibration certificate should clearly identify the equipment, calibration date, relevant measurement results, applicable standards or methods, and traceability information.

SAC’s policy on calibration traceability recognises calibration by the National Metrology Centre or a calibration laboratory accredited by SAC for the relevant scope.

Choosing a Calibration Service Provider in Singapore

Look for relevant ISO 17025 accreditation

When comparing calibration services in Singapore, don’t look at the ISO 17025 label alone. Check the laboratory’s actual scope of accreditation.

SAC accreditation applies to specific calibration activities, measurement ranges and fields. A laboratory can only issue SAC-accredited reports for calibrations covered by its accredited scope.

This matters because a laboratory may hold ISO 17025 accreditation but not cover the particular equipment or measurement you need.

Consider authorised service centres

For specialised biomedical test equipment, an authorised service centre can offer another advantage. Technicians familiar with the manufacturer’s equipment can provide calibration, servicing and repair within the same technical environment.

At Leedon, we operate an ISO 17025 Rigel-Approved Service Centre and provide calibration, service, and repair for Rigel biomedical test equipment. Since 2026, we have also operated an Approved IMT Calibration Centre in Singapore for gas flow devices and analysers.

Check the calibration certificate

Before choosing a provider, ask what documentation you will receive. Check that the certificate clearly identifies the equipment, calibration results, standards used, measurement uncertainty where applicable, and traceability information.

Frequently Asked Questions

Is calibration the same as preventive maintenance?

No. Calibration checks the accuracy of measurements against a known standard, while preventive maintenance keeps equipment in good working condition and helps prevent faults. Depending on the equipment, you may need both.

What is an ISO 17025 accredited calibration lab?

An ISO/IEC 17025-accredited calibration laboratory has undergone an independent assessment of its competence in specific calibration activities. In Singapore, SAC-SINGLAS assesses calibration laboratories against ISO/IEC 17025 and grants accreditation for defined scopes.

How long does medical equipment calibration take?

The time depends on the equipment, the number of measurements required, its condition and whether the service includes adjustment or repair. Ask your calibration provider for the expected turnaround time before sending equipment in, especially for devices that your clinical teams rely on every day.

Keep Your Equipment Measurements Reliable

Calibration is more than ticking a maintenance box. It gives your team a structured way to check whether equipment continues to provide reliable measurements and creates records that support your equipment management process.

If you’re comparing a calibration company in Singapore, look beyond turnaround time. Check the provider’s technical expertise, relevant accreditation scope, traceability arrangements and experience with the equipment you use. For specialised biomedical equipment, an authorised service centre can also simplify calibration, servicing and technical support.