Table 2. Precision (%CV) and Accuracy (%RE) Results for Quality Control Samples (n = 6) of CCK8 and ppCCK(21–44), Prepared in Organoid Secretion Buffer and Quantified against a Calibration Curve.

spiked concentration (pg/mL)	25	50	100	400
CCK8
mean	24.8	52.6	118.1	402.9
standard deviation	3.2	6.3	12.9	2.2
%CV	12.8	12.0	10.9	0.5
%RE	–0.7	5.2	18.1	0.7
ppCCK(21–44)
mean	25.8	42.0	118.3	437.2
standard deviation	0.9	2.7	12.8	16.0
%CV	3.3	6.5	10.8	3.7
%RE	3.3	–16.1	18.3	9.3