Performance of low-dose cosyntropin stimulation test in the afternoon

Earlier research on 1 μg low-dose test (LDT) performed using 20.3 cm plastic IV tubing on healthy volunteers, has shown that afternoon testing was associated with a sevenfold increased likelihood of failing the test. Nevertheless, it has been claimed that subnormal cortisol response using plastic tubes might have resulted from cosyntropin adherence to the tube and, thus, loss of the delivered dosage. Following from our previous study, which...