This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Labour, Subject name: Gynaecology & Obstetrics
Pressure of normal uterine contractions is between 190-300 units. Which unit is being referred to here? 
Select and explain. 
A. Montevideo units, B. mm of Hg, C. cm of water, D. Joules/kg
A: Montevideo units
Answer: A: Montevideo units 
Explanation: Ans. is a, i.e. Montevideo unitsRef Williams Obs, 23/e, p 4371 montevideo unit = Intensity of constraction x number of contractions in 10 mins.Montevideo unit is to define uterine activity.As per this:Clinical labour usually commences when uterine activity reaches values between 80-120 Montevideo units (This translates into approximate 3 contractions of 40 mm of Hg every 10 minutes).During labour--Normal uterine contractions are between 190-300 Montevideo units (At the time of delivery it is 300 Montevideo units)