What this case does and does not tell you

This case supports one narrow but consequential conclusion: a documented short fill on a citrate tube is a sufficient reason to hold coagulation results and request recollection, independent of what the numbers say about the patient. It does not support any conclusion about this patient's actual coagulation status, because the specimen itself is not a valid representation of that patient's blood at the moment of collection.

The exact discard-tube requirement, high-hematocrit cutoff and adjustment formula, inversion counts, line-draw waste volumes, and timed-collection label formats are governed by your local validated procedure and by current manufacturer instructions. Where a specific number is cited here, such as the 15-minute lactate separation window or the hematocrit 55% trigger, that number comes from a named method-specific or peer-reviewed source and may differ from your facility's validated procedure.

CLIA (Clinical Laboratory Improvement Amendments) regulation requires written procedures that preserve specimen identification and integrity from collection through reporting, and requires documentation of when a referred specimen is received. Those requirements are the regulatory floor under everything taught here; your local procedure is how your laboratory meets that floor in practice.

Order of draw and special handling protect the specimen's integrity before analysis; when a specimen was not built correctly, the correct analyzer in the world cannot fix that.