The delta check
is a measurement of the difference between a patient's sequential test results.
Our laboratory had long used a delta check
of the MCV value in patients' CBCs to suggest the possibility of a specimen error, including misidentification.
Therefore, much has been done to try to prevent it, and several result verification methods, such as delta check
(1) and multivariate delta check
(2), have been developed to detect it.
Regarding specimens found to be improperly labeled, most (73.6%) were detected by laboratory review ("lab check"), 9.9% by feedback from caregiver, and 9.1% by delta check
(see Table 1).
These were combinations of two different tests (e.g., hemoglobin and mean corpuscular volume) as well as combinations of a test result with its previous historical result (delta check
Munoz (2) reported on the practices of 340 laboratories for repeating critical values and delta check
values, from a 2007 survey.
violations should be investigated before reporting the current value.
We would like to begin by using delta check
values that other places have used.
We picked up the error when a delta check
was done on one of the patients when a follow-up lab was ordered.
Initially, a delta check
is performed at the CBC workstation.
* Result integrity problems (such as delta check
Sophistication in the lab has created delta checks
that allow technology to cross-reference a patient's results.