Food Safety Atlas

Work out an MPN

Three tubes at each of three dilutions. Select the tubes that showed growth. A filled tube has grown.

0.1 g
0.01 g
0.001 g
Positive tubes: 3, 1, 0

43 MPN/g

95 percent confidence: 9 to 180 per gram.

0.11101001,00010,000

Notice how wide the range is. An is an estimate, so a result near a needs care.

Source: (August 2023), Table 1.