a monthly basis, DHI laboratories are required to participate in the
QCS Samples Unknown program to verify the accuracy of their instruments.
of the monthly samples unknown program is such that:
Monday of the second full week of each month, the samples
unknown supplier sends
duplicate sets of 12 samples to each of the participating DHI component
Monday of the third full week of each month, the QCS laboratory
auditor downloads the raw data from the web site and analyzes the
the analysis is complete, monthly certification and comparison
Samples Unknown Schedule - Released September
link below is to the QCS samples unknown web site where the monthly results
data is entered and the certification reports are generated. It
should only be
accessed by laboratories participating in the program and will not
information to other parties.