# A laboratory worker prepared a 1:200 dilution of whole blood. The diluted blood gave a count of 30 RBCs per hemocytometer square (100 µm × 100 µm). How many RBCs are in 1 mL of the diluted blood and in 1 mL of the whole blood?

##### 1 Answer

There are

#### Explanation:

**Step 1. Calculate the volume of a hemocytomer square**

So, there are 30 RBCs in

**Step 2. Calculate the number of RBCs in a volume of #"1 cm"^3# (1 mL)**

**Step 3. Calculate the number of RBCs in 1 mL of whole blood**

Your dilution factor is 200.

∴ In 1 mL of whole blood,