Sign in →

Test Code PETH Phosphatidylethanol Confirmation, Blood

Important Note

Do not use alcohol to clean arm. Use alternative (such as Betadine, also known as Povidone Iodine) to cleanse site before specimen collection.

Additional Codes

Epic Ordering Code LAB305379
NBS code LBC13487
Service code 37227

Reporting Name

Phosphatidylethanol Confirmation, B

Specimen Type

Whole Blood EDTA


Specimen Required


Container/Tube: Lavender top (EDTA)

Specimen Volume: 1 mL

Collection Instructions:

1. Do not use alcohol to clean arm. Use alternative (such as Betadine, also known as Povidone Iodine) to cleanse site before specimen collection.

2. Draw blood in tubes smaller than 10 mL if possible.

3. Do not centrifuge.

4. Send whole blood specimen in original tube. Do not aliquot.


National University Hospital-Singapore Note:

NUH Outreach Laboratories:
Specimen Requirements
Submit the following:
Container: Purple Top
Processing Requirements
Do not centrifuge or aliquot
Specimen type: Whole Blood
Volume: 1 mL
Storage/transport requirements: Frozen

Forms

If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

-Kidney Transplant Test Request

-Therapeutics Test Request (T831)

-General Test Request (T239)

-Renal Diagnostics Test Request (T830)

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Whole Blood EDTA Frozen (preferred) 28 days
  Refrigerated  14 days

Reject Due To

Gross lipemia OK
Gross icterus OK

Method Name

Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

Day(s) Performed

Monday through Sunday

Report Available

2 to 5 days
National University Hospital-Singapore Note:

Please note that this is a referral test requiring transport to the external testing facility and an additional 3-5 days is required.

Reference Values

Negative (<10 ng/mL)

 

Cutoff concentrations by liquid chromatography tandem mass spectrometry:

PEth 16:0/18:1 (POPEth): 10 ng/mL

PEth 16:0/18:2 (PLPEth): 10 ng/mL

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Useful For

Verifying abstinence or use of ethanol, especially in liver transplant candidates/patients

CPT Code Information

G0480

80321 (if appropriate for select payers)

Clinical Toxicology CPT Code Client Guidance

LOINC Code Information

Test ID Test Order Name Order LOINC Value
PETH Phosphatidylethanol Confirmation, B 101506-4

 

Result ID Test Result Name Result LOINC Value
617481 PEth 16:0/18:1 (POPEth) by LC-MS/MS 97607-6
617482 PEth 16:0/18:2 (PLPEth) by LC-MS/MS 97606-8
617483 PEth Interpretation 69050-3

Secondary ID

617480

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.
National University Hospital-Singapore Additional Information:

Last updated 05/08/2026