Plate count agar

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Plate Count Agar (PCA), also called Standard Methods Agar (SMA), is a microbiological growth medium commonly used to assess or to monitor "total" or viable bacterial growth of a sample. PCA is not a selective medium. The composition of plate count agar may vary, but typically it contains (w/v):[1]

0.5% peptone
0.25% yeast extract
0.1% glucose
1.5% agar
pH adjusted to neutral at 32 C for 48 hours.


  1. ^ Atlas, R.M. (2004). Handbook of Microbiological Media. London: CRC Press. p. 1390. ISBN 0-8493-1818-1.