Interstitial fluid for diagnosis - (IMAGE) Georgia Institute of Technology Caption Interstitial fluid (right) may provide an alternative source of biomarkers compared to blood (left) that could be useful in diagnosing human illness. Credit Allison Carter, Georgia Tech Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.