Physiological measurement:

Physiological Measurement can be  classified as In Vivo  and In Vitro. In -Vivo includes measurements of those which are performed  directly within or on  living organisms themselves; such as blood flow determination through radiography, IVP,  Cholecystography. An  In Vitro measurement by  contrast  is performed  outside the  organism's body, such as blood glucose, blood urea,  serum Na⁺,  K⁺.  

Physiological measurements can also be  classified as listed below: 

• Physical measurement  -  Temperature, Volume, Pressure, Electricameasures.  
• Chemical measurements -  hormone  levels,  sugar, urea,  Hb%, potassium level, etc. 
• Microbiological measurement  --  bacterial  connts and  identification. 
• Anatomical and Cytological measurements  -  X-rays, tissue biopsies, tomography, CAT  Scan, etc.