Phenolphthalein, Stool
Test Mnemonic
PHENO
CPT Codes
- 84311 - QTY (1)
- G0480 - QTY (1)
LOINC ®
16183-6
Performing Laboratory
Quest Diagnostics (Chantilly)
FDA Category
In Vitro Diagnostic
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 10 g | Stool | Sterile container | Frozen |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 5 g |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | Unacceptable |
| Refrigerated | 7 days |
| Frozen | 7 days |
Days Performed
Sun - Fri
Turnaround Time
3 - 5 days
Methodology
| Name | Description |
|---|---|
| Colorimetry |
Reference Range
Special Info
Separate samples must be submitted when multiple tests are ordered.
Clinical Info
Phenolphthalein is a cathartic agent that acts mostly on the colon. Since it takes at least 6 hours to work, it is often taken at bedtime to produce a laxative effect the following morning. 85% of what is ingested is excreted in the feces; the remainder is absorbed and eliminated mostly in the urine. The test is used to detect laxative abuse.