NAPT Results

Jr. Stevens  |  5/4/2005 10:22:26 AM

Our lab employs modern quality assurance program in its analytical process and is the only Louisiana laboratory that participates in the well-recognized North American Proficiency Test (NAPT) program and maintains an acceptable level of proficiency.


LSU AgCenter
Soil Testing and Plant Analysis Laboratory
 Analytical Performance

North American Proficiency Test
Quarterly Results for last three years.

Test Date
Percent Acceptable (%) *
Soil Analysis
Plant Analysis
1st Q, 2007
2nd Q, 2007
3rd Q, 2007
4th Q, 2007
1st Q, 2008
2nd Q, 2008
3rd Q, 2008
4th Q, 2008
1st Q, 2009
2nd Q, 2009
3rd Q, 2009
4th Q, 2009
95
94
98
99
99
99
NA
97 
99
97 
90
94
98
98
98
100
99
100
NA
100
100
100
98
98


* Based on a total of 115 and 39 analyses submitted for each round of proficiency soil and plant samples respectively. The NAPT program sets 4xMAD (Median Absolute Deviation) as its control limits for each analysis. The common acceptable proficiency level for routine commercial laboratories is 75% on a yearly basis.

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