. >> reporter: miriam harper, a mother of four, had complications after a miscarriage at 12 weeks. >> just started bleeding more and more, to the point where it was really concerning. >> reporter: harper was rushed to the hospital, her third trip to a dallas area medical facility in two days. >> they charged me for blood typing. >> reporter: not long after, as she grieved, the bills started coming. >> i think it's a reminder of just emptiness, and then other bills keep pouring in and this lab and that lab. >> reporter: what was surprising about those bills, the amount she was charged for the same tests, a pair of ultrasounds at two different facilities. $150 at her birthing center, but more than $1500 at this hospital. are you surprised by that? >> shocked. there is no kind of accountability whatsoever. it's just all over the place. >> reporter: something we discovered when our partner, clear health costs, surveyed cash price, used here as a benchmark for comparison for some of the most common procedures and tests in the dallas metro area, including this one, a cardiovascular stress t

. >> reporter: miriam harper, a mother of four, had complications after a miscarriage at 12 weeks. >>t started bleeding more and more, and to the point where it was really concerning. >> reporter: harper was rushed to the hospital, her third trip to a dallas-area medical facility in two days. >> they charged me for blood typing. >> reporter: not long after, as she grieved, the bills started coming. >> i think it's a reminder of just emptiness, and then the other bills just keep pouring in, and this lab and that lab. >> reporter: what was surprising about those bills? the amount she was charged for the same tests, a pair of ultrasounds, at two different facilities: $150 at her birthing center, but more than $1,500 at this hospital. are you surprised by that? >> shocked. there's no kind of accountability whatsoever. it's just all over the place. >> reporter: something we discovered, when our partner "clear health costs" surveyed cash prices, used here as a benchmark for comparison, for some of the most common procedures and tests in the dallas metro area, including this one: a cardiovas