Flashcards in Deciding what is normal and interpreting blood counts Deck (6)
State some factors that affect what is ‘normal’.
What is the difference between a reference range and a normal range?
Reference Range = derived from a carefully defined reference population e.g. children 5-10 years
Normal Range = much vaguer – it should represent the people that live in the local area and come to the hospital
How is a reference range determined?
Samples are collected from healthy volunteers with defined characteristics.
The data is analysed by appropriate techniques.
If the data follows a normal (Gausian) distribution, you can determine what is normal by taking the mean and taking 2 standard deviations on either side. Between the 2 SDs on either side, you will have 95% of the data.
What unit is MCV measured in?
What unit is MCH measured in?