The degree to which malabsorption occurs in symptomatic and asymptomatic cases is highly varied. Classification of periapical periodontitis is usually based on whether the process is acute/symptomatic or chronic/asymptomatic. Genetic testing is available for symptomatic individuals and asymptomatic relatives. They may also symptomatic or asymptomatic, according to whether they cause any problems or not. Some records show whether the isolates were obtained from symptomatic or asymptomatic carriers. It is known that centrally acting antihistamines modulate the symptoms of acute symptomatic vertigo. Patients with urinary tract infections caused by "S. saprophyticus" usually present with symptomatic cystitis. Estimates of the ratio of asymptomatic to symptomatic infections have ranged from 3 to 100. These are used in persistent symptomatic cases without exacerbation. Elevation of liver enzymes without signs of symptomatic liver disease has been infrequent. Midodrine is indicated for the treatment of symptomatic orthostatic hypotension. Occipital lobe epilepsies are etiologically idiopathic, symptomatic, or cryptogenic. Treatment usually involves supportive care with possible symptomatic measures employed. FIPV causes feline infectious peritonitis, for which treatment is generally symptomatic and palliative only. Disease management typically focuses on achieving symptomatic relief.