Her primary doctor was concerned for carcinoid syndrome after a 24 hour urine 5-HIAA level was elevated to 22.7 mg/24 hours (normal <6 mg/24hours). After negative CT and octreotide scans, it was felt that the patient's 24 hour urine 5-HIAA test was falsely elevated due to dietary ...
Thus, plasma chromogranin A and 5-hydroxyindoleacetic acid (5-HIAA) should be tested in a 24-hour urine sample, and marked octreotide scintigraphy should be performed in the follow-up period (9). Goblet cell carcinoid of the appendix accompanied by adenomatous polyp with high-grade dysplasia ...
A 24-hour urine sample is preferred for the 5-HIAA test because the level of the metabolite can vary during the day. For a 24-hour urine collection, all of the urine produced should be saved for a 24-hour period. It is best to keep the sample in a cool, dark place, such as a ...
Measuring a single fasting plasma 5-HIAA level is much more convenient than the 24-hour urine collection. A recent study compared the 2 assays in a group of 115 individuals with all types of NETs (among which 72 had midgut tumors) and 47 patients with midgut tumors metastatic to the liver...
All subjects had toxicologic screening of blood, urine, and bile and a clinical history. Most subjects had brain toxicologic screening for selected psychotropic drugs and alcohol (28% had positive brain screen results in the face of negative results of peripheral body fluid screening) to ensure ...
Objectives: 5-Hydroxyindoleacetic acid (5-HIAA) is used for the evaluation of neuroendocrine tumors (NETs) but currently requires a 24-hour urine collection.Tellez, Maria R. PhDMamikunian, Gregg MSO'Dorisio, Thomas M. MDVinik, Aaron I. MD, PhD...
Twenty-four-hour and overnight urine samples were collected from 34 patients and analyzed for urinary 5-HIAA (U5-HIAA) using high-performance liquid chromatography. Comparison of the overnight sampling values with the 24-hour values showed no difference, p=0.45, and there was a significant ...
FMT intervention decreases urine 5-HIAA levels: a randomized double-blind controlled studydoi:10.3389/fmed.2024.1411089Lihong WangLianhu YuZhiyue LiuChao CheYu WangYongheng ZhaoMengna ZhuGuang YangAihua CaoFrontiers in Medicine
Excretion of free and conjugated 5-HIAA and VMA in urine and concentration of 5-HIAA and HVA in CSF during migraine attacks and free intervals. Headache 1972;12:62-5Kangasniemi , P., Sonninen , V., Rinne , U. K.: Excretion of free and conjugated 5-HIAA and VMA in urine and ...
Increased urinary excretion of 5-HIAA and diminished excretion following a gluten-free diet were confirmed in children with coeliac disease, in 24 and 8 hour urine collections (Challacombe et al., 1972; Challacombe et al., 1975), and measurement of 8 hour urinary 5-HIAA was proposed as an...