PCR Master Mix Example for a 25 uL Reaction

You need eight sample reactions plus one positive control and one no-template control at 25 uL each.

The purpose of this example is to show how overage and control planning should be done before reagents are thawed.

Reaction count: 10 total wells.

Add 10 to 15 percent overage to reduce pipetting error during master mix preparation.

Confirm whether primer concentration and polymerase conditions match the kit insert.

Use the calculator output to prepare one shared master mix, then aliquot identical volumes into each tube or plate well.

Record the final reagent table in the bench notebook so the same setup can be repeated later without recalculating.

Forgetting to include controls in the total reaction count.

Using the correct total volume but forgetting that stock concentrations may differ from kit defaults.

Adding template before the master mix is fully balanced.