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Abnormal gel flotation caused by contrast media during adrenal vein sampling. A – plasma sample in 3.5 mL tube with 52.5 USP U of lithium heparin and gel separator. B – serum sample in 3.5 mL serum tube with clot activator and gel separator. RAV – right adrenal vein. ICVSR - inferior vena cava in the suprarenal portion. ICVIR - inferior vena cava in the infrarenal portion. LAV - left adrenal vein.
