Clinical Chemistry Numericals Practice Test

Pipettes are categorized by design as either to contain (TC) or to deliver (TD), indicating what the instrument is intended to do with the liquid in the tip. The term that corresponds to contain is to contain, because TC pipettes are designed so that the stated volume is what the pipette holds in the tip when filled to the calibration mark. In other words, their design is to contain the nominal volume in the tip until it is dispensed, with the delivered amount potentially affected by technique. The other options aren’t about which design the pipette uses: delivering describes the TD type, while calibrate and measure refer to processes rather than the containment/delivery design distinction.