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Answer for the clue "A measuring instrument for measuring changes in volume of a part or organ or whole body (usually resulting from fluctuations in the amount of blood it contains) ", 14 letters:
plethysmograph

Word definitions for plethysmograph in dictionaries

WordNet Word definitions in WordNet
n. a measuring instrument for measuring changes in volume of a part or organ or whole body (usually resulting from fluctuations in the amount of blood it contains)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Plethysmograph \Pleth"ys*mo*graph\, n. [Gr. ? an enlargement + -graph.] (Physiol.) An instrument for determining and registering the variations in the size or volume of a limb, as the arm or leg, and hence the variations in the amount of blood in the limb. ...

Wikipedia Word definitions in Wikipedia
A plethysmograph is an instrument for measuring changes in volume within an organ or whole body (usually resulting from fluctuations in the amount of blood or air it contains).

Wiktionary Word definitions in Wiktionary
n. (context medicine English) An instrument for measuring changes in volume within an organ or whole body (usually via fluctuations in the amount of fluid it contains).

Usage examples of plethysmograph.

One lead hooked him into the plethysmograph and the Lissajous oscilloscope and the GSR galvanometer.

In Dean's experiments, participant receivers lay quietly on a cot in a darkened room, while an optical plethysmograph with a small light bulb and a photocell recorded changes in their fingers' blood volume, which is a measure of autonomic nervous system activity.