Taking the first few steps towards recovering from your opiate addiction is huge. No matter how you ended up with your opiate addiction, you can always take steps to get clean. However, an important first step is to understand what to expect during your first week or two of opiate withdrawal.
With anticoagulant = plasma (still has soluble fibrinogen). Without anticoagulant = serum ( fibrinogen has been converted into insoluble fibrin in clot and is spun down with cells). Source(s): Medical Scientist. liz down under Â· 9 years ago.
Serum, Plasma, Whole blood. SERUM, PLASMA OR WHOLE BLOOD COLLECTION. Draw blood in the color-coded VacutainerÂ® tube indicated in the alphabetical test listing. For serum or plasma, draw approximately 2 1/2 times the requested volume. For serum, allow the blood to clot sixty minutes and separate by centrifugation.