Lisaproovi

Lisaproovi is a term used in Estonian laboratory and clinical practice to describe an extra specimen collected for testing in addition to the primary sample. It is typically taken from the same patient and during the same encounter, but can also be obtained at a later time if necessary. The purpose of a lisaproovi is to enable additional analyses, confirmatory testing, or parallel studies without requiring another full patient encounter.

Collection and handling of a lisaproovi follow standard specimen procedures. The sample is labeled with the patient’s identifier, specimen type, date and time, and the reason for the extra draw. It is handled according to the same biosafety and preanalytical protocols as the primary sample, with attention to minimizing degradation and contamination. A separate aliquot may be prepared to preserve the original specimen and allow multiple tests to be run without repeated collections. Documentation typically records the reason for the lisaproovi and any specific tests requested.

Common uses include confirmatory testing when initial results are equivocal, supplementary analyses requested by clinicians, quality control checks, or research purposes requiring additional material. In some settings lisaproovi are stored for later re-analysis or longitudinal studies, subject to institutional retention policies and privacy regulations.

Ethical and legal considerations emphasize informed consent when appropriate, protection of patient privacy, and secure handling and storage of sample materials. Proper chain-of-custody and data linkage practices help ensure traceability and accountability throughout the testing process.