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Critical Values

Diagnostic Services: BC & Yukon Centre

Diagnostic Services considers certain test results to be “critical values”. Such findings will be reviewed by the Canadian Blood Services Medical Director and communicated to the requesting facility or physician as soon as possible.

Test Interpretation - Critical Values

Reference Testing

  • Significant antibody(ies) has/have been identified and it may be difficult to obtain blood in the future.
  • It has been determined that a hemolytic transfusion reaction has occurred
  • ABO discrepancy between current sample and previous record

Perinatal Testing

  • Anti-K is detected in maternal sample.
  • Antibody titre ≥ 16 in maternal sample.
  • Positive DAT on cord blood or neonatal sample