Table 13—

Recommendations for diagnostic strategy

Statement	Class^#	Level^¶
Ventilation/perfusion lung scan is recommended in patients with unexplained PH to exclude CTEPH	I	C
Contrast CT angiography of the PA is indicated in the work-up of patients with CTEPH	I	C
Routine biochemistry, haematology, immunology and thyroid function tests are indicated in all patients with PAH, to identify the specific associated condition	I	C
Abdominal ultrasound is indicated for the screening of portal hypertension	I	C
High-resolution CT should be considered in all patients with PH	IIa	C
Conventional pulmonary angiography should be considered in the work-up of patients with CTEPH	IIa	C
Open or thoracoscopic lung biopsy is not recommended in patients with PAH	III	C

PH: pulmonary hypertension; CTEPH: chronic thromboembolic pulmonary hypertension; CT: computed tomography; PA: pulmonary artery; PAH: pulmonary arterial hypertension. ^#: class of recommendation; ^¶: level of evidence.