High Positive Concentration, X (ng/mL) Following Specimen Concentration, Y (ng/mL) Conclusion
X > 100,000 Y > 50

Repeat analysis after blank

100,000 > X ≥ 50,000 Y < 50

No action required

100,000 > X ≥ 50,000 50 < Y < 200

Repeat analysis after blank

100,000 > X ≥ 50,000 Y > 200

No action required

Table 6: Carryover evaluation criteria for benzoylecgonine. Values for other medications will vary. The ULOL and carryover limit for benzoylecgonine is 100,000 ng/mL.
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