In the following items, each passage consists of six sentences. The first sentence (S1) and the final sentence (S6) are given. The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark accordingly on the Answer Sheet. 

S1: I will not be able to see you tomorrow. 
P: There is only a simple laboratory test to be done. 
Q: Once I know what the diagnosis is, I can contact the doctor. 
​R: However, if you like, you can phone me. 
S: We will then follow his instructions. 
S6: At any rate I see you later in the week.