Diseases | Clinical clues | Diagnoses | |||
---|---|---|---|---|---|
History | Physical diagnosis | Chemistry | Screening test | Additional test | |
Parenchymal renal diseases | Urinary tract infection or obstruction, analgesic abuse, familial history of polycystic kidney disease | Abdominal mass (polycystic kidney disease) | Proteinuria, hematuria, pyuria, reduced glomerular filtration rate (GFR) | Renal ultrasound (US) | Further studies for kidney diseases |
Renal artery stenosis | Fibromuscular dysplasia, premature hypertension (female), atherosclerotic diseases, sudden onset or worsening of hypertension, resistant hypertension, recurrent pulmonary edema | Abdominal bruit | Rapid worsening of renal function [spontaneous or after angiotensin converting enzyme (ACE) inhibitor or angiotensin II receptor blocker (ARB) treatment] | Kidney size difference > 1.5 cm, Duplex Doppler US, computed tomography (CT) | Magnetic resonance imaging, digital subtraction angiography |
Primary aldosteronism | Muscle weakness, premature hypertension, familial history of premature stroke (< 40 years) | Arrhythmia (severe hypokalemia) | Hypokalemia (spontaneously or after treatment by diuretics), incidental adrenal mass | Aldosterone-renin ratio (after correction of hypokalemia and excluding effect of ACE inhibitor or ARB) | Suppression test by saline infusion, fludrocortisone, and/or captopril); adrenal CT, adrenal vein sampling |
Pheochromo-cytoma | Paroxysmal hypertension, emergency visit by persistent hypertension with headache, sweat, and/or pallor, familial history | Café-au-lait lesion and neurofibromatosis neurofibroma | Incidental adrenal mass (extraadrenal mass in some cases) | Metanephrine and/or nor-metanephrine in 24-h urine | Abdominal and/or pelvic CT or magnetic resonance imaging (MRI); radioisotope scan using meta-iodobenzyl-guanidine |
Cushing syndrome | Rapid weight gain, polyuria, polydipsia, psychiatric problems | Central obesity, moon face, buffalo hump, abdominal striae, hirsutism | Hyperglycemia | Cortisol in 24-h urine | Dexamethasone suppression test |