Representative mass chromatograms of β-diol, and β-diol-d3 (a) in double blank pooled sera (with neither β-diol nor β-diol-d3); (b) in blank pooled sera (with β-diol-d3 only, 4.00 ng/mL); (c) in pooled sera at LLOQ (0.0500 ng/mL; β-diol-d3, 4.00 ng/mL); (d) in pooled sera at 50.0 ng/mL β-diol, and 4.00 ng/mL β-diol-d3; (e) in mouse serum sample # 2 at 0.100 ng/mL β-diol, and 4.00 ng/mL β-diol-d3; (f) in mouse serum sample # 3 at 0.110 ng/mL β-diol, and 4.00 ng/mL β-diol-d3.