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HelpTest Code DSU Drug Screen, urine
Additional Codes
| Epic Ordering Code | LAB1838 |
| NBS code | LBC04942 |
| Service code | 31719 |
Specimen Requirements
Submit only one of the following immediately:
Preferred: Sterile screw-capped urine container without preservatives
Processing Requirements
Collect mid-stream urine in preservative-free urine container. Unacidified Urine.
Specimen Type: Random urine specimen without preservatives
Volume: 10 mL
Storage/transport requirements: Refrigerated
Specimen Stability
| Specimen Type | Urine |
|---|---|
| Ambient (Within NUH Only) | 2 hours |
| Refrigerate | 2 days |
| Frozen | 2 weeks |
Specimen Condition
| Haemolysis | Not applicable |
|---|---|
| Icterus | Not applicable |
| Lipaemia | Not applicable |
| Others | Not applicable |
Methodology
Immunochromatography
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
| Methamphetamines | Negative: < 1000 ng/mL |
|---|---|
| Cocaine | Negative: < 300 ng/mL |
| Cannabis | Negative: < 50 ng/mL |
| Benzodiazepines | Negative: < 300 ng/mL |
| Tricyclic Antidepressants | Negative: < 1000 ng/mL |
| Barbiturates | Negative: < 300 ng/mL |
| Phencyclidine | Negative: < 25 ng/mL |
| Amphetamines | Negative: < 1000 ng/mL |
| Opiates | Negative: < 300 ng/mL |
| Methadones | Negative: < 300 ng/mL |
| Creatinine, Urine | If Creatinine is 0.4 – 1.8 mmol/L and Specific Gravity is < 1.003, urine may be considered diluted. If Creatinine is < 0.4mmol/L and Specific Gravity is < 1.001, urine may be substituted or not present. Reference: SAMHSA 2003 |
| Specific Gravity, Urine | 1.003 – 1.030 |
This assay provides only a preliminary qualitative result.
A positive result does not indicate level of intoxication or route of administration.
A negative result may be obtained when the drug is present below cut-off level of the test.
A negative result may also occur as the detection for various compounds within the same drug class can vary.
Some foods, food supplements and medications may produce erroneous results.
A result may be confirmed by sending a sample to Health Sciences Authority Toxicology Laboratory.
Where contamination or adulteration of sample is suspected, the test should be repeated with another specimen.
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Detecting drug abuse.
LOINC Code Information
| Methamphetamines | 3779-6 |
|---|---|
| Cocaine | 3397-7 |
| Cannabis | 3426-4 |
| Benzodiazepines | 3390-2 |
| Tricyclic Antidepressants | 11004-9 |
| Barbiturates | 3377-9 |
| Phencyclidine | 3936-2 |
| Amphetamines | 3349-8 |
| Opiates | 3879-4 |
| Methadones | 3773-9 |
| Creatinine, urine | 14683-7 |
| Specific Gravity, urine | 2965-2 |
Update
Last updated 09/04/2026