Table 1. Classification of missed diagnostic opportunities by rejection code.

Type of Error	Classification	Examples of LIS Rejection Codes
Pre-Analytical Error	Insufficient	• Insufficient sample volume for testing • Sample container empty
	Unsuitable	• Not done: Poor quality sample Unsuitable for testing: Sample clotted • Incorrect sample type: Require EDTA sample
	Clerical Error	• Labelling error: Information on form differs from sample • Incomplete form: No age or date of birth • Incomplete form: No patient name or surname
	Pre-Analytical Lab Error	• Sample lost in transit • Sample leaked in transit • Sample too old for testing • Not done: Sample spun for plasma test
Analytical Error	Indeterminate	• Indeterminate result
	Invalid	• Invalid result: PCR inhibition
	Lab Error Not Specified	• Technical problem

LIS, Laboratory Information System