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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Clin Biochem. 2015 Jun 26;48(18):1283–1290. doi: 10.1016/j.clinbiochem.2015.05.023

Table 4.

Carryover assessment from a highly concentrated sample and the low QC sample.

Morphine M3G M6G Hydromorphone
Mean of low-low results (ng/mL) 6.43 6.18 5.92 7.30
Mean of high-low results (ng/mL) 7.25 6.82 6.44 7.87
SDlow-low results (ng/mL) 0.43 0.43 0.31 0.34
Carryovera (ng/mL 0.82 0.64 0.52 0.56
a

Carryover = (mean of high-low results) - (mean of low-low results). Acceptable carryover is less than 3 × SDlow-low results.