A practical workflow for capillary microsampling in nonclinical studies.

The result of investigation on the procedure of sample handling and bioanalysis of small volume of plasma sample for nonclinical studies stored in 0.5-ml micronic tubes was reported. Sample integrity of the small volume (25 μl) during long-term storage and the feasibility and data reliability of performing multiple re-assays on the small volume sample using 5 μl aliquot per analysis was evaluated. Integrity was maintained in samples (25 μl) stored for up to 1 month in 0.5-ml micronic tubes at -20°C. A 25 μl sample is sufficient for four-times of re-assays. This evaluation demonstrated the feasibility of this workflow of handling and bioanalysis on small volume plasma sample for GLP studies under the US FDA guidance.