| A | Arterial |
| B | Blood |
| C or cap | Capillary, or the region of blood-tissue ex- change |
| cell | Cell |
| D | Diffusive, or indicating a permeant tracer |
| ECF | Extracellular fluid |
| F | Flow or filtration |
| i,j | Indices in series or summations or elements of arrays |
| in or i | Into or inside or inflow |
| ISF or I | Interstitial fluid space, the extravascular extracellular fluid |
| m | Membrane |
| out or o | Out of or outside or outflow |
| P | Plasma |
| RBC | Red blood cell |
| R | Reference, nonpermeant tracer |
| S | Solute |
| T | Total |
| v | Venous |
| W | Water |
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