FIGURE 3. (A) Gastric-emptying curves of liquid test meal labeled with phenol red and ^99mTc-albumin colloid. Gastric emptying measured with phenol red photospectrometry (liquid phenol red) did not significantly differ from gastric emptying measured with pinhole scintigraphy (liquid scintigraphy). (B) Individual time-point measurements of gastric phenol red recovery and gastric retention measured with pinhole scintigraphy. Correlation between methods was good (R = 0.96; r = 0.86; P < 0.001).