There is less fluid
thus less Ca++ in blood
Sodium citrate (mL) = 100 – Hct (%) x
amt. of blood
595 – Hct (%)
You want to draw a 5.0
mL tube from a patient with a Hct of 60%. How much sodium citrate do you need to have in
tube?
Sodium citrate (mL) = 100 – 60
x 4.5
595 – 60
Sodium citrate (mL) = 0.34 mL
Normal ratio of 9:1 in 5 ml draw =
4.5 mL blood + 0.5 mL sodium citrate