laboratory diagnostic - biochemistry - Lithium erythrocytes - whole blood EDTA. Standard collection : collect the sample in the morning 12hrs after administration and before any further treatment. Prolonged administration collection : (given in the evening) collect sample in the morning 12hrs after administration or in the evening 24 hrs after administration and before any further treatment. Attach completed information form (ref: R13), Spectrometry, todylaboratories®, bmn, code L16LD1250