Laboratory Name:
MN Lab ID:
Method Detection Limit Study (MDL) Form
Analyst Name (print):
Analyst Signature:
Instrument ID:
Prep Method:
Analytical Method:
Target Analyte:
Matrix:
Reported Units:
All values must be recorded in the same units. Standard prepared in reagent water should be at a
concentration between 1 and 5 times the anticipated MDL. All replicates prepared for the MDL study must
be used in the calculations.
Rep. Result
% Recovery
Pass/Fail QC
True Value*
1)
Upper Limit %
2)
Lower Limit %
3)
Reporting Limit
4)
Student’s T Value
5)
Std Deviation
3.143
6)
MDL**
7)
MDL = (Standard Deviation of Replicate Analysis) * T
T = 3.143 (Student’s T Value) for 7 replicates. More replicates will require a different student’s T value.
*The true value must be no greater than 10 times the calculated MDL.
**MDL must be less than the reporting level. Ideally the RL is 2 - 10X the MDL.
PASS
FAIL
A copy of the raw data used to calculate the MDL must be attached to this form.
MN Rules 4740.2100 Subp.7.A, CFR 136 Appendix B Rev 1.11
Created by MDH: revised 09Nov2006