Predictive values of blood tests to diagnose LTBI have not been … – AAP News (subscription) Predictive values of blood tests to diagnose LTBI have not been …AAP News (subscription)TB test (Oxford Immunotec, Oxfordshire, UK). This test stimulates the patient's lymphocytes in vitro with ESAT-6 and CFP-10, and counts the number of … Immunotec's momentum…