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Test Code DSCRM Drug Screen, Prescription/OTC, Chain of Custody, Serum

Additional Codes







Useful For

Detection and identification of prescription or over the counter drugs frequently found in drug overdose or used with a suicidal intent


This test is designed to qualitatively identify drugs present in the specimen; quantification of identified drugs, when available, may be performed upon client request.


Chain of custody is required whenever the results of testing could be used in a court of law. Its purpose is to protect the rights of the individual contributing the specimen by demonstrating that it was under the control of personnel involved with testing the specimen at all times; this control implies that the opportunity for specimen tampering would be limited.

Additional Tests

Test ID Reporting Name Available Separately Always Performed
COCH Chain of Custody Processing No Yes

Reporting Name

Drug Scrn, Prescription/OTC, CoC, S

Specimen Type

Serum Red

Specimen Required

Supplies: Chain-of-Custody Kit (T282) containing the specimen seals and documentation are required

Container/Tube: Red top; kit contains the specimen seals and documentation required

Preferred: One 10-mL red

Acceptable: One 5-mL red

Specimen Volume: 2.75 mL

Collection Instructions: Collect specimen, centrifuge within 2 hours of collection and aliquot serum, cap and seal, and submit with the associated documentation to satisfy the legal requirements for chain-of-custody testing.

Additional Information:

1. This test is not appropriate for drugs of abuse/illicit drug testing, including benzodiazepines, opioids, barbiturates, cocaine, amphetamine type stimulants.

2. This test is not appropriate for assessment of therapeutic compliance.

3. Not intended for use in employment-related testing.

4. See Table 1 in Prescription and Over-the-Counter (OTC) Drug Screens in Special Instructions.

Specimen Minimum Volume

1.1 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Red Refrigerated (preferred) 14 days
  Frozen  14 days
  Ambient  3 hours

Reject Due To


Mild OK; Gross OK


Mild OK; Gross OK


Mild OK; Gross OK


Plasma or serum gel tube

Reference Values

Drugs detected are presumptive. Additional testing may be required to confirm the presence of any drugs detected.

Day(s) and Time(s) Performed

Monday through Sunday; Varies

Analytic Time

3 days

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
DSSX Drug Scrn, Prescription/OTC, CoC, S In Process


Result ID Test Result Name Result LOINC Value
36185 Drugs detected: 20785-2
36186 Chain of Custody 77202-0

Method Name

Gas Chromatography-Mass Spectrometry (GC-MS)