lab-on-a-chip
/ lab on uh chip /
Imagine shrinking a whole laboratory bench — its mixing, heating, separating, and detecting — onto a plastic card the size of a postage stamp, with channels thinner than a hair carrying droplets from step to step. That is a lab-on-a-chip: a complete analysis miniaturised onto a single small device.
Concretely, a lab-on-a-chip is a microfluidic device that integrates one or more laboratory functions on a chip a few square centimetres in size, moving and processing tiny volumes of fluid — nanolitres to microlitres — through engraved channels. It can combine sample preparation, reaction, separation, and detection so that a drop of sample goes in and a result comes out.
Working at this scale brings real gains: vanishingly small sample and reagent use, fast results because tiny volumes mix and heat quickly, low cost per test, and true portability for field or bedside use. The trade-offs are that fabrication and fluid handling at micro scale are technically demanding, surfaces can clog or stick, and sensitivity can suffer simply because there is so little material to detect.
A credit-card-sized chip takes a single drop of blood, splits it through hair-thin channels, mixes it with reagents, and runs a tiny electrophoretic separation, returning a multi-test blood panel at the bedside without a central laboratory.
A whole bench of steps, shrunk onto one tiny card.
Lab-on-a-chip is the enabling technology behind many point-of-care tests; it is also called a micro total analysis system when the chip performs every step from sample to answer.