Corrections For Contamination

Question 1

Calculations made to correct for WBCs introduced in the CSF because of

Answer 1

traumatic tap

Question 2

Correction for Contamination Formula

Answer 2

WBC Added = WBC (blood) x RBC (CSF) / RBC (blood)

Question 3

Shortcut Method

Answer 3

𝑪𝒐𝒓𝒓𝒆𝒄𝒕 𝑾𝑩𝑪 𝑪𝒐𝒖𝒏𝒕 = 𝐴𝑐𝑡𝑢𝑎𝑙 𝑊𝐵𝐶 𝐶𝑜𝑢𝑛𝑡 − 𝑊𝐵𝐶 𝐴𝑑𝑑𝑒𝑑

Question 4

If the peripheral WBC and RBC are normal

Answer 4

Subtract 1 WBC for every 700 RBCs present in the CSF