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. 2017 May 19;7(6):417–422. doi: 10.1016/j.jpha.2017.05.006

Table 1.

Extraction recovery of ergocalciferol and ergocalciferol-d6.

QC level (ng/mL)	Ergocalciferol			Ergocalciferol-d6
	Mean area response		Extraction recovery (%)	Mean area response		Extraction recovery (%)
	Post-extraction spiking	Pre-extraction spiking	Extraction recovery (%)	Post-extraction spiking	Pre-extraction spiking	Extraction recovery (%)
HQC (80.0)	7006545	5818432	83.0	493724	427070	86.5
MQC-1 (40.0)	3578144	3001422	83.9	483473	419236	86.7
MQC-2 (3.00)	287385	240530	83.7	493898	431564	85.4
LQC (0.300)	29514	25201	85.4	489605	427845	87.4

HQC: high quality control; MQC: medium quality control; LQC: low quality control.

Extraction recovery: (pre-extraction spiking/post-extraction spiking) × 100.