"depending on a person’s insurance, getting a culture can be expensive." How is this possible? I live in a country not famous for its low cost health treatmen

"depending on a person’s insurance, getting a culture can be expensive." How is this possible? I live in a country not famous for its low cost health treatments, but I paid the equivalent of $6 (six dollars) for an urine culture just some days ago, and it was a full price paid to a private company, no insurance, no subsidy. How much can a culture cost in the US?