How Classification Works
The risk-based approach
Singapore uses a four-class, risk-based classification system for medical devices, defined in the Health Products (Medical Devices) Regulations 2010. The four classes are A (lowest risk), B (low-to-medium risk), C (medium-to-high risk), and D (highest risk).
Classification is determined by applying a set of rules that consider:
- Intended purpose — what the device is claimed to do;
- Contact with the body — whether the device is non-invasive, invasive, or implanted, and which part of the body it contacts or enters;
- Duration of contact — transient (less than 60 minutes), short-term (60 minutes to 30 days), or long-term (more than 30 days);
- Active device principles — whether the device uses electrical, thermal, or other energy;
- Special characteristics — whether the device incorporates a drug, is made from biological material, or is intended for specific high-risk applications such as spinal, cardiovascular, or central nervous system use.
The four classes
| Class | Risk level | Registration requirement | Examples |
|---|---|---|---|
| Class A | Lowest | Exempt from registration; product notification required | Non-sterile dressings, tongue depressors, non-sterile examination gloves, wheelchairs |
| Class B | Low-to-medium | Registration required | Hypodermic needles, sterile dressings, non-active contact lenses, basic IVDs for self-testing |
| Class C | Medium-to-high | Registration required | Ventilators, long-term implantable orthopaedic devices (non-bioactive), haemodialysis machines, HIV diagnostic IVDs |
| Class D | Highest | Registration required; most stringent evaluation | Active implantable devices (pacemakers, neurostimulators), Class D IVDs (blood donor compatibility testing), drug–device combinations |
Applying the classification rules
Classification is not self-declared in a free-form way — it is determined by applying the rules in Schedule 1 of the HP(MD) Regulations in order. The rules follow the GHTF/IMDRF model and are broadly similar to (but not identical to) the EU MDR Annex VIII or TGA classification framework.
HSA provides two tools to assist:
- Risk classification rules and factors: hsa.gov.sg/medical-devices/registration/risk-classification-rule
- Risk classification tool (interactive): hsa.gov.sg/medical-devices/registration/risk-classification
These tools do not replace the need to read the regulations, but they help identify the applicable rule and likely classification for common device types.
IVD classification
In vitro diagnostic medical devices follow a separate set of classification rules also set out in the HP(MD) Regulations. IVDs are classified based on the intended use, the analyte or parameter detected, and the consequences of an incorrect result. See IVD Classification.
Classification as the gateway to all other decisions
Classification determines:
- Whether product registration or only a product notification is required;
- Which evaluation route applies (and therefore what documentation is required and what the turnaround time will be);
- Which registration guides apply;
- The scope of post-market obligations;
- Fees and annual charges.
Getting classification right at the outset is therefore critical to the entire Singapore regulatory strategy.
When classification is uncertain
For genuinely borderline cases — devices that could be Class B or C, or where the classification rules could be read either way — HSA's Consultation Schemes allow a formal pre-submission request for HSA's view. The Innovation Office also handles novel device types where existing rules may not clearly apply.
Do not assume a more favourable classification without seeking HSA's view if there is genuine ambiguity. Misclassification discovered at the evaluation stage will require re-submission and additional time and cost.