The Massachusetts General Hospital Handbook of Neurology

Authors: Flaherty, Alice W.; Rost, Natalia S.

Title: Massachusetts General Hospital Handbook of Neurology, The, 2nd Edition

Copyright 2007 Lippincott Williams & Wilkins

> Table of Contents > Procedures > Blood Draws

Blood Draws

A. Electrolytes

Green top (heparinized) or tiger top (serum separator).

B. CBC, blood bank

Lavender top (EDTA as anticoagulant)

C. General chemistries

Red top (plain, allows clotting).

D. PT/PTT

Blue top (citrate). Test is not accurate if tube not filled.

E. Glucose

Grey top (K oxalate)

F. Hypercoagulability panel

Usually 4 blue tops and a large red top.