can you use a urine sample to test cholesterol level? Our family doctor couldn't check my daughters choles. level by urine and said it would have to be checked by taking blood. She is 6, has had high cholest in the past and we left the pediatrician. doctor and now our children are seeing my husband and my family doctor. We have had a lot of problems with physicians here so they are going to the same doctor we are. (family doctor) Thanks!