I had my cholesterol tested at an urgent care facility and it was 213. Four days later, I tested my cholesterol with the Cholestrak and it was around 157 (somewhat difficult to determine if it was 157 or 161 or even possibly 164). I did change my diet drastically for the last 4 days, but I highly doubt it made this much of a difference in only 4 days. If it did, I would be really happy! I'll know how much my cholesterol really changed in a month when I go back to have it checked at the urgent care facility again.