| Table 5: | ||
|
Factors
that Interfere with Determination of Urinary 5-HIAA
|
||
|
Factors
that Produce False-Positive Results
|
Factors
that Produce
False-Negative Results |
|
|
Foods
|
Drugs
|
Drugs
|
| Avocados | Acetaminophen | Corticotropin |
| Bananas | Acetanilid | p-Chlorophenylalanine |
| Eggplants | Caffeine | Chlorpromazine |
| Pineapples | Fluorouracil | Heparin |
| Plums | Guaifenesin | Imipramine |
| Walnuts | Lugol's (iodine) solution | Isoniazid |
| Melphalan | Methenamine mandelate | |
| Mephenesin | Methyldopa | |
| Methamphetamine | Monoamine oxidase inhibitors | |
| Methocarbamol | Phenothiazine | |
| Methysergide maleate | Promethazine | |
| Phenacetin | 5-HIAA, 5-hydroxyindoleacetic acid | |
| Phenmetrazine | ||
| Reserpine | ||
| Adapted from reference 11 | ||
|
Copyright
2004 The Cleveland Clinic Foundation
|