Testing costs and turnaround times vary. Genetic test results are usually ready in three to four weeks. Though genetic testing costs are often paid for by insurance carriers, patients may be required to pay some or all of the cost when the test is ordered.esting costs and turnaround times vary. Genetic test results are usually ready in three to four weeks. Though genetic testing costs are often paid for by insurance carriers, patients may be required to pay some or all of the cost when the test is ordered.