The crossword solution for the term 'blood measurement' is UNIT, which is a four-letter word. Blood measurement is the process of measuring the amount of certain components in the blood, such as red and white blood cells, platelets, and hemoglobin. The UNIT used to measure these components is typically milliliters (mL) or microliters (μL). This UNIT is often abbreviated as UNIT, which is the answer to the crossword puzzle.