The population-based reference interval is the most widely used tool for interpretation of individual patient laboratory test results. The clinical value of those results depends crucially on the reference intervals with which they are compared, and all efforts directed at ensuring analytically precise and accurate test results are, to a greater or lesser extent, in vain if the relevant reference interval is invalid or deficient in some way. In order to be considered a normal distribution, a data set must follow a bell-shaped symmetrical curve centered around the mean. How to explain to an elderly with no concept of normal distribution. I will be explaining Electrocardiography (ECG) is one of the most vital and readily used screening computer screening tool in clinical medicine. It is inexpensive and easily obtained in both the inpatient and outpatient setting. We're just basically going to monitor your heart rhythm. This test will not harm you in any way please stay calm and still while the rest is going it will be over as soon as possible. Just a quick check to see if everything is on beat.

Normal ECG

The question is how would you respond to this statement?