Get Chaoter 9 Preanalytical Considerations

Preventing preanalytical errors is necessary to ensure accurate and safe patient testing. Patient identification must be ensured prior to venipuncture.

The preanalytical phase is the phase where the laboratory has no direct control on the process. Preanalytical factors that can affect results include: sample type, sampling time, sample handling, patient's preparation and the nutritional status of the patient.

These and other factors that may influence analytical results include: Time before separation from cells (for plasma). ... Centrifugation conditions. ... Special separation requirements. ... Division of the sample into a sufficient number of aliquots of a sufficient volume. ... Temperature and time between separation and analysis.

Preanalytical Considerations Patient identification must be ensured prior to venipuncture. ... Samples must be properly collected in the correct collection tube and labeled at the patient's bedside to ensure validity and sample integrity.

Method of specimen identification. An example of a preanalytical error happening during specimen processing is: Inadequate centrifugation.

Preanalytical phase comprises of test selection, patient identification, collection of the sample, handling of the sample, sorting out, pipetting and centrifugation (2, 3). Negligence in any of these steps can lead to erroneous results attributed to preanalytical phase.

Preanalytical phase comprises of test selection, patient identification, collection of the sample, handling of the sample, sorting out, pipetting and centrifugation (2, 3). Negligence in any of these steps can lead to erroneous results attributed to preanalytical phase.

Preanalytical variables include those related to the patient, specimen collection and specimen handling. “Patient variables include: age, body mass, gender, race, diet, medications, smoking, pregnancy, exercise, dehydration”.