A 24 - year - old woman presents to her GP with mildly painful swelling of her right leg and acute shoness of breath. She is 32 weeks pregnant with her second child but is otherwise well and has no other medical history. With regard to this which of the following statement is NOT true?

D - dimers would not be of any value as they are raised to ' abnormal ' levels in pregnancy. Likely causes of this condition: Deep vein thrombosis and venous obstruction by the pregnant uterus. An ultrasound of deep veins of the right leg would look for a deep vein thrombosis. Pulmonary embolism could be the cause for shoness of breath, to rule out this V/Q scan is useful.