RDW
RDW is a measure of the heterogeneity of the RBC population.It is derived from the RBC histogram using the 20th and 80th percentiles.
EDTA draw tube at least half full
Plasma(EDTA)
None
routine venipuncture
2 mL screw-cap tube
2-8 C (ice packs) or frozen
store at 2-8 C up to 3 days, frozen at -20C to -80C for up to 6 weeks
Major Risk for heart disease-<40 mg/dL Negative risk for heart disease->60 mg/dL
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