Box 1.

The ASSURED criteria for point-of-care diagnostics (World Health Organisation)

Affordable (<5 US$ per test)
Sensitive (ideally 99%)
Specific (ideally 98%)
User-friendly (requiring minimal training)
Robust (no cold chain) and rapid (<1 hour: same-day results and same-day care) and require little or no operator calibration, and minimal routine maintenance (eg wiping spills, dusting)
Equipment-free (battery-operated, few moving parts, handheld/compact)
Deliverable (commercially available and approved).