McFarland unit for Susceptibility testing

Bob Friedel rfriedel at
Wed Jun 28 11:01:53 EST 2000

McFarland Standards are composed of Barium Sulfate suspensions (scale 1-10).
You will also need a Wickerham card to compare the McFarland standard with
the organism suspension.  See Difco Manual 10th edition, p. 565, 1984.

They can be purchased for $5.45 each from Hardy Diagnostics

Bob Friedel
Quality Assurance Manager
Perritt Laboratories
rfriedel at

<prenna at> wrote in message
news:3959B5F0.D950CE44 at
> Hi group,
> anybody knows how to prepare a McFarland scale to be used in determining
> approx culture density when performing susceptibilty testing?
> Thanx
> Luca

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