Diphenhydramine

Primary unit: ng/ml
LOINC codes: 3570-9
Tests that measure Diphenhydramine: Labcorp 1, Quest Diagnostics 1

Tests

Check the catalog code, specimen, method and preparation for every test that measures Diphenhydramine. Select up to five tests to compare them side by side.

Labcorp 1 test

Single-analyte tests

Diphenhydramine, Serum or Plasma 808420
Serum · Fasting not stated · Turnaround 7 - 14 days
Method and collection
Method
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Preparation
Trough levels are most reproducible.
Collection
Serum or plasma should be separated from cells within two hours of venipuncture. Submit serum or plasma in a plastic transport tube.
Reference notes
Antihistaminic effect: 30−50 ng/mL; sedative effect: 50−300 ng/mL
Labcorp catalog page

Quest Diagnostics 1 test

Single-analyte tests

Diphenhydramine, Serum/Plasma 34002
Serum · Fasting not stated · Turnaround Set up: Sun-Fri
Method and collection
Method
High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS)
Collection
Promptly centrifuge and separate serum or plasma into a transport tube
Quest Diagnostics catalog page

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Sources

Labcorp test catalog
1 test: codes, specimens, methods, preparation and reference intervals.
Quest Diagnostics test catalog
1 test: codes, specimens, methods, preparation and reference intervals.
LOINC 3570-9
Regenstrief Institute codes that identify the same result across labs.
Search ClinicalTrials.gov for Diphenhydramine
Registered studies that measure Diphenhydramine, on the U.S. National Library of Medicine registry.

Verify these ranges and sources

We compile this page from named laboratory catalogs, guidelines and studies. Labs calculate reference intervals from the people they test, for one assay method and one population group, so an interval describes that population rather than an optimal target.

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