(1) CAP'S PT program utilizes samples identical to patient samples and not only validates individual laboratories but utilizes peer comparison to generate more accurate ranges for proficiency samples
. Periodic review of QC results is a frequent tool for maintaining quality control of patient samples.
Preliminary data for testosterone, hydromorphone, and sirolimus demonstrated perfect agreement with proficiency samples
without heteroscedastic bias.
In proficiency samples
, we statistically determined the Luminex cutoff values that can predict a positive XM to be more than 2 SDs from the mean of samples associated with a negative XM.
This report underscores the need to use good laboratory practices to minimize cross-contamination of specimens during set up and analysis, not only when dealing with proficiency samples
, but during daily operation with patient specimens.
Proficiency testing is the ongoing process in which a series of proficiency samples
, the characteristics of which are not known to the participants, are sent to laboratories on a regular basis.
(13.) Cement and Concrete Reference Laboratory Proficiency Sample
Program: Final Report Portland Cement Proficiency Samples
Number 133 and 134, Cement and Concrete Reference Laboratory, Gaithersburg, MD, September 1999.
We also prepare and provide microbiology proficiency samples
to various clinical proficiency providers in the United States.
We thought this difference could be attributable to either inappropriate freeze-thawing of the CAP proficiency samples
by a large number of reporting laboratories, a procedure that is expressively proscribed by CAP, or that the Immulite platform yields lower plasma ACTH results than the Scantibodies IRMA.
These criteria, coupled with a good quality control program including XB (range of means), external proficiency samples
, and other sample comparisons can help assure quality operations in a hematology laboratory.
Extraction of whole-blood calibrators, controls, proficiency samples
, and human specimens was performed according to a recently published protocol (7).
You may want to check on proficiency samples
through CAP or other proficiency-testing providers.
We examined the effect of unconjugated estriol on other immunoassay methods for estradiol by preparing two proficiency samples
: one containing unconjugated estriol (at 4 [micro]g/L), and the other with no such addition.