Controls and replicates are what turn an in-vitro measurement into an interpretable result: controls provide a reference point, and replicates show how reliable the measurement is. This guide explains both.
What a control is
A control is a condition run alongside the test condition to provide a baseline. A negative control shows the readout with no active compound; a positive control shows the readout with a known responder.
Why controls matter
Without controls, a readout has no reference. Controls let researchers separate the effect of interest from background signal and from assay artifacts.
What replicates are
Replicates are repeated measurements of the same condition. They reveal the variability of the assay and make it possible to tell a real difference from random noise.
Technical vs biological replicates
Technical replicates repeat the measurement on the same sample; biological replicates repeat the whole experiment on independent samples. Both strengthen a conclusion in different ways.
Related research guides
- In-vitro methods & assays (overview)
- Cell viability & proliferation assays
- Binding assays (affinity)
- Verify peptide purity
Research-use note
All compounds referenced are supplied for in vitro laboratory research use only. They are not for human or animal use.
Related research: In vitro research methods and assays overview.
