Transfusion Medicine
Equipment and Resources
TM-ERAlmost nothing in a transfusion laboratory is read with the naked eye alone — a spin speed, a wash cycle, a storage temperature or a warmer setting sits behind every result and every unit issued. This domain covers running that equipment to procedure, proving it still performs, and recognising the moment it stops performing. A device that drifts quietly is more dangerous than one that stops, because it keeps producing results that look normal. Equipment and Resources is one of the eight competency areas assessed in the Transfusion Medicine Fields-of-Practice examination set by CAMLPR.
Running, calibrating and servicing blood bank instruments
Transfusion laboratories depend on temperature-controlled and speed-controlled devices: serological centrifuges, automated cell washers, 37 °C incubators and water baths, red cell refrigerators, plasma freezers, platelet incubators with agitators, and in-line blood warmers. A technologist runs each device to a written procedure, verifies its performance against an independent standard such as a calibrated thermometer or a tachometer, and records the result. Calibration is carried out at installation, after any repair, and at defined intervals thereafter. Daily checks of temperatures, alarm function and saline delivery are documented, so that if a device does fail the affected period can be dated and the affected units traced.
A transfusion laboratory installs a replacement serological centrifuge. Before it is used for routine tube testing, a technologist has to establish the correct spin setting for antiglobulin work. Which approach establishes that setting?
The continuous monitor log below comes from a refrigerator holding red cell units. The temperature drifted above the permitted storage range and stayed there for roughly two hours before the audible alarm sounded. How should the alarm limits be programmed?
Recognising a failing instrument and acting on it
Equipment rarely fails loudly. It usually fails as a drift, a weakening reaction, or a control that no longer behaves as it should, so the technologist has to read those signals before patient results leave the laboratory. This area covers spotting the pattern — every antiglobulin test in a run turning negative, cell buttons that will not resuspend, a refrigerator trace creeping upward — then isolating the cause, taking the device out of service, repeating the affected work by an alternative method, and documenting what was found. Keeping the wash reservoir topped above a litre of saline and reading check cells belong to the same routine.
On an evening shift, every antiglobulin crossmatch and antibody screen in a batch of eleven samples reads negative. When IgG-sensitised check cells are added to those negative tubes, none of them agglutinate. All eleven were processed on the automated cell washer. Which fault best accounts for this batch?
A patient receiving rapid transfusion through an in-line blood warmer passes dark red urine. The clerical check is correct, the repeat ABO group matches the unit, and the direct antiglobulin test is negative. Infusion ran by gravity with no pressure device, and the warmer has not been checked against an independent thermometer since it was installed two years ago. Which explanation best fits these findings?
Back to all transfusion medicine areas in the Transfusion Medicine study guide.
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