Прошу прощения, был неточен: сыворотка, не плазма (желтокрышечная вакуумная пробирка с гелем).
Цитата:
Most manufacturers recommend serum as the preferred specimen, rather than EDTA- or heparinized-plasma. For optimal results and maximum serum yield, it is recommended that whole blood samples be allowed to clot for at least 30 minutes before centrifugation and separation. Serum can be stored at 4-8°C for up to one week.
Storage at -20°C is recommended if the assay is to be delayed for more than one week. Collection of serum in barrier gel tubes does not affect the results of most TSH and thyroid hormone tests.
(из архивированного лабораторного [Ссылки доступны только зарегистрированным пользователям ] AACC-2002).