(edit: thanks for editing your post which stated there was no centrifugation while pointing to the FDA link w/ instructions. Holding to facts generally also comes with admitting when you're wrong. Thanks for showing true colors to all who have not yet seen).
SPECIMEN COLLECTION AND PREPARATION Consider any materials of human origin as infectious and handle using standard biosafety procedures. Plasma 1. Collect blood specimen into a lavender or blue top collection tube (containing EDTA or citrate, respectively, in a Vacutainer®) by venipuncture. 2. Separate the plasma by centrifugation. 3. Carefully withdraw the plasma into a new pre-labeled tube. Serum 1. Collect blood specimen into a red top collection tube (containing no anticoagulants in a Vacutainer®) by venipuncture. 2. Allow the blood to clot. 3. Separate the serum by centrifugation. 4. Carefully withdraw the serum into a new pre-labeled tube.
And incase you want to question the who can run it:
Testing is limited to laboratories certified under the Clinical Labo ratory Improvement Amendments of 1988 (CLIA), 42 U.S.C. 263a, to perform moderate and high complexity tests