The McFarland Equivalence Turbidity Standards are used to prepare suspensions of micro-organisms in microbiology.
Density
Standard
1.5 * 10^8 per mL
0.5
3.0 * 10^8 per mL
1
6.0 * 10^8 per mL
2
9.0 * 10^8 per mL
3
12.0 * 10^8 per mL
4
15.0 * 10^8 per mL
5
18.0 * 10^8 per mL
6
21.0 * 10^8 per mL
7
24.0 * 10^8 per mL
8
27.0 * 10^8 per mL
9
30.0 * 10^8 per mL
10
McFarland Standard =
= 0.333333 * 10(-8) * (number per mL)
density per mL =
= (McFarland Standard) * 3 * 10^8
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Purpose: To determine the turbidity of a solution using a McFarland standard.
Objective: laboratory tests
ICD-10: A00-B99,
