Conversation so far:
where do you find interstitial fluid in the human body
Interstitial fluid is the body fluid between blood vessels and cells.
what does interstitial fluid contain
Interstitial fluid consists of a water solvent containing sugars, salts, fatty acids, amino acids, coenzymes, hormones, neurotransmitters, white blood cells and cell waste-products.

Question: is the fluid identical to plasma
Self-contained rewrite: is interstitial fluid identical to plasma