To evaluate the effect of anti-hypertensive medication on efficiency of primary aldosteronism screening and confirmatory test, and to determine the appropriate diagnostic cutoff value for Chinese hypertension patients during antihypertensive drugs therapy.

Aldosterone-Renin ratio (ARR)is currently the most reliable means available for screening for primary aldosterone（PA）while captopril challenging test is the widely used confirmatory test. However, some antihypertensive drugs may interfer aldosterone and renin levels. Thus, PA guidelines suggest that antihypertensive drugs should be withdraw or change therapy before screening.

But withdraw/changing the therapy is inconvenient for patients.

The investigators prepare to start a prospective study through recruiting hypertension patients, completing the ARR screening and captopril challenging test before and after withdraw/change therapy.

Inclusion Criteria:

• Persistent hypertension >150/100mmHg, including previously diagnosed grade 2 hypertension but well controlled by 1-2 drugs; newly diagnosed hypertension with 3 days blood pressure > 150 / 100mmHg
• Resistant hypertension(combined with three antihypertensive drugs and one of them is diuretic but blood pressure is still greater than 140 / 90 mmHg ; or need to combined four anti-hypertensive drugs to control the blood pressure under 140 / 90 mmHg)
• Family history of hypertension with early onset (< 40 years old)
• Family history of hypertension with early onset (<40 years old) and cerebrovascular accident
• Hypertension with spontaneous or diuretic hypokalemia
• Hypertensive with adrenal incidentaloma
• Hypertensive with OSAS
• First-degree relatives of PA patients and with hypertension Stable antihypertensive medication therapy for more than 2 weeks, medication including：β-blockers, CCB, ACEi, ARB, MRA, and other diuretics.

Exclusion Criteria:

• Patients hard to change or stop the medication for accomplish the screening test or diagnosis Unwilling to participate the study and refuse to sign on informed consent Patients who was diagnosed with other secondary hypertension Suspected with PA（rein concretion beyond the limit of normal reference range after stoping or changing the medication） Severe renal insufficiency （eGFR<30 ml/min/1.73m2）; pregnancy

Patients in the Department of Endocrinology and physical examination center of First Affiliated Hospital of CQMU who with hypertension, and under anti-hypertension medication therapy and being certificated with high risk factors of PA were recruited as the study group.