An observational study in Primary Aldosteronism, sponsored by Peking Union Medical College Hospital. Recruiting at 1 site in China. Open to participants aged 18 Years to 70 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-06-09.
Sponsored by Peking Union Medical College Hospital · Observational
Primary aldosteronism (PA) is the most common cause of secondary hypertension. Liquid chromatography - tandem mass spectrometry (LC-MS/MS) is more accurate than the traditional radioimmunoassay in measuring aldosterone. This study aims to establish a more precise diagnostic threshold for the oral sodium loading test (OSLT) by using LC-MS/MS to measure urinary aldosterone levels. We will combine the biochemical results of OSLT and other data from healthy volunteers and suspected PA patients to determine a new 24-hour urinary aldosterone threshold. We expect to improve the diagnostic accuracy of PA, helping clinicians identify this curable cause of hypertension earlier and more accurately, and achieving precise treatment.
201 studies on the registry are indexed under Hyperaldosteronism; 93 are open to participants now.
This study's planned enrollment of 800 is above the median of 200 across 103 observational studies indexed under Hyperaldosteronism.
Browse Hyperaldosteronism studies →Peking Union Medical College Hospital is the lead sponsor of 1,155 studies on the registry; 475 are open to participants now.
Of its 5 completed or terminated interventional studies of FDA-regulated products, 0 (0%) have results posted.
Counted across the registry records on this site, refreshed daily.
1）Healthy Controls to establish physiological suppression limits.2) Patients with suspected PA undergo oral sodium loading test to determine the cut-off point.
Inclusion criteria for the normal control group: Age 18-70 years old, : 18.5-23.9kg/m ²，gender not restricted. blood pressure: 100-120/60-80mmHg. no history of hypertension. No abnormal nodules found in adrenal CT. Previous blood potassium and were all within normal ranges., No history of liver or kidney dysfunction, malignant tumors, metabolic diseases or cardiovascular diseases, and no medication used.
Exclusion criteria: Those with a family history of hypertension or with clinical manifestations of secondary hypertension. Those who have been taking drugs that may affect the RAAS system for a long time (such as , , etc.). Those with cardiac dysfunction or severe arrhythmia and unable to tolerate the test.
Patients with suspected primary aldosteronism in the outpatient setting. Inclusion criteria: Patients with suspected primary aldosteronism in the outpatient setting. Willing to undergo 4-week spironolactone treatment and cooperate with follow-up.
Exclusion criteria: Patients who did not complete the oral sodium loading test. Patients with Cushing's syndrome or other endocrine tumors. Patients allergic to spironolactone or with for its use (such as severe hyperkalemia, \< 30).History of liver or kidney dysfunction, coexisting severe cardiovascular or cerebrovascular diseases, history of malignant tumors, other types of endocrine hypertension (hyperthyroidism, pheochromocytoma, Cushing's syndrome, etc.), renal artery stenosis, hypokalemia caused by other factors (renal tubular acidosis, Bartter syndrome, Gitelman syndrome, etc.), diabetes with > 7.0% or currently using or having used insulin or SGLT2 inhibitor drugs, taking special medications such as glucocorticoids, , oral contraceptives, etc.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
A recording of the heart’s electrical activity, taken with stickers on the chest, arms and legs. It takes a few minutes and does not hurt.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
A blood test of average blood sugar over the past two to three months, given as a percentage or in mmol/mol. 6.5% (48 mmol/mol) or more is the usual threshold for diabetes, normally confirmed by a second test.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECG (electrocardiogram)
A recording of the heart’s electrical activity, taken with stickers on the chest, arms and legs. It takes a few minutes and does not hurt.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
GFR and eGFR (kidney filtering)
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HbA1c
A blood test of average blood sugar over the past two to three months, given as a percentage or in mmol/mol. 6.5% (48 mmol/mol) or more is the usual threshold for diabetes, normally confirmed by a second test.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Healthy volunteers with normal blood pressure and blood potassium levels and no adrenal nodules. These volunteers were used to determine the normal physiological range (lower limit value) of aldosterone inhibition after the test.
Diagnostic Test: The oral sodium loading test
Patients suspected of having primary aldosteronism
Diagnostic Test: The oral sodium loading test
These subjects underwent a three-day high-salt diet test, during which they consumed an additional 6-10 grams of salt each day. On the third day, tests were conducted on the aldosterone, sodium, potassium and creatinine levels in the 24-hour urine, blood potassium, creatinine, standing aldosterone concentration, plasma renin activity, and the steroid hormone profile.
24-hour urinary aldosterone levels after a 3-day high-sodium diet
Time frame: Two weeks after completing the oral sodium loading test
Plan to share: No
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