Concentration levels (µg/mL)

Concentration added (µg/mL)

RSD (%)

RE (%)

Accuracy

Intra-day

Inter-day

Paracetamol

Low QC

200

0.2

1.5

0.8

Middle QC

250

0.1

1.3

0.7

High QC

300

0.1

1.8

1.1