University of Colorado Boulder What time is your body clock set on? The answer, mounting research suggests, can influence everything from your predisposition to diabetes, heart disease and depression to the optimal time for you to take medication. But unlike routine blood tests for cholesterol and hormone levels, there’s no easy way to precisely measure a person’s individual circadian rhythm. At least not yet. New CU Boulder research, published in the Journal of Biological Rhythms, suggests that day could come in the not-too-distant future. The study found that it’s possible to determine the timing of a person’s internal circadian or biological clock by analyzing a combination of molecules in a single blood draw.