For average mast cells. Metric is mean count per high power field (HFP) 6. 2 standard deviations.
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esophagus: 0-0.15 (tryptase) and 0-0.70 (CD117)
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stomach: 0.85-24.17 (tryptase) and 4.60-31.11 (CD117)
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duodenal villi: 0-4.98 (tryptase) and 0-8.38 (CD117)
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duodenal crypts: 10.74-30.28 (tryptase) and 9.04-41.96 (CD117)
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colon: 5.16-26.58 (tryptase) and 10.59-35.57 (CD117)
CD117 counts were consistently higher than those with tryptase stain (p<0.01).
Average and peak MC counts were correlated (mean coefficient of determination r250.74, p<0.01).
source: [Journal of Clinical Allergy](https://www.jacionline.org/article/S0091-6749(22)01810-3/pdf