This is the first post in our Order of Draw Deep Dive series, where we'll explore the history, science, and clinical significance of each tube type in the CLSI-recommended collection sequence.
Shanise Keith,
January 06, 2026
This is the second post in our Order of Draw Deep Dive series. Last week, we explored blood culture bottles and why sterility makes them first in the collection sequence. This week, we're examining light blue top tubes and discovering why coagulation tes
Shanise Keith,
January 13, 2026
This week, we're examining serum tubes—plain red tops and gold serum separator tubes (SST)—and discovering why these tubes must be drawn before tubes containing EDTA, heparin, or other anticoagulants
Shanise Keith,
January 20, 2026
This week, we're examining green top heparin tubes—and discovering why tubes that prevent clotting must come after tubes that depend on clotting.
Shanise Keith,
January 27, 2026
