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Preanalytic variables documented for PLCO specimens.
| Vacutainer tube type (and additive) Glass/plastic tube |
| Volume |
| Freeze thaw cycles |
| Hemolyzed |
| samples Icteric |
| samples Lipemic |
| samples |
| Uncontrolled thaw |
| Deviations from SOPs (e.g. blood drawn in incorrect tube at a specific screening visit) |
| Biospecimen receipt anomalies (e.g. upon receipt at the repository, were the samples thawed when they should have been frozen?) |
