Four specimens, one shift

A results queue shows four cortisol and ACTH (adrenocorticotropic hormone) specimens collected across a single working shift for one patient. They arrive out of order, and only some of them carry complete collection-time and handling metadata. First determine which of these four specimens can be interpreted as drawn.

The first specimen is a 07:55 paired ACTH/cortisol draw. Under this assay's local controlled procedure, the ACTH tube required immediate ice and cold centrifugation; those steps cannot be copied to another system without its own validated requirement. The cortisol tube followed routine serum handling. Both carry a documented collection time. The second specimen is a cortisol result with no recorded collection time at all, so there is no way to place it on the circadian curve. The third is an ACTH tube that missed this assay's validated handling and sat at room temperature for several hours before it reached the laboratory. The fourth is a cortisol drawn near midnight with no order note explaining whether it was meant to test suppression or was simply a late random draw.

None of these four results is inherently a wrong number. Each is a measurement produced by a working analyzer on a real specimen. What is missing, or present, is the context that turns a number into an interpretable result: a clock time, a matched partner, a handling history consistent with the analyte's stability needs, and a stated reason for the draw.

Before reading any cortisol or ACTH value as high, low, or normal, confirm the collection time and handling history. For ACTH, use only the chilled or ambient path required by the cited assay manufacturer, reference laboratory, or local controlled procedure; handling requirements cannot be copied between systems.