500 uL Serum or Plasma
- Collect 1mL whole blood, spin, separate and freeze (-20oC)
- Specimens collected on an SST tube should be separated within 90 minutes of receipt.
- Avoid repeated freeze-thaw cycles.
Measurement of corticosterone may help confirm the diagnosis of the very rare aldosterone deficiency disorder, corticosterone methyl oxidase (18-hydroxylase) enzyme deficiency where the ratio of corticosterone to 18-hydroxycosticosterone may be increased.
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