The “Corn Test” for Constipation is Worthless

I met with a patient this week — an 8-year-old boy with both daytime and nighttime wetting — who had been advised by another physician to check for constipation using the “corn test.” I told the boy and his dad what I always tell folks about the ever-popular corn test: Don’t bother. Yes, the corn test is easy, noninvasive, and costs nothing — well, besides the corn. You simply eat corn and note how long it takes for the bright yellow kernels to show up in your stool. (Corn is recommended because it doesn’t get fully digested and is easy to identify in poop.) The number of hours is considered the corn’s “transit time.” My patient’s dad told me, “Our urology clinic said that one day is normal

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