What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveOrder

LOINC Code 104596-2: Phenytoin & Phenobarbital panel (S)

Name: LOINC Code 104596-2: Phenytoin & Phenobarbital panel (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:19.127Z

104596-2 is a LOINC code used to identify Phenytoin & Phenobarbital panel (S) in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Phenytoin & Phenobarbital panel. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Phenytoin & Phenobarbital panel. It is commonly used with the system or sample type Ser.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Order
Panel type: Panel

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Phenytoin and Phenobarbital panel - Serum
Phenytoin & Phenobarbital panel
Barbiturate; c417; DI-HYDAN; Dilantin; Dilj; Diphenylhydantoin; DPH; DRUG/TOXICOLOGY; Drugs; Epanutin; Fenantoin; Lehydan; Luminal; Nirvonal; Pan; PANEL.DRUG & TOXICOLOGY; Panl; PHBR; Phenhydan; Phenobarb; Phenytoin & Phenobarbital pnl; PHYT; Pnl; Point in time; Random; Serum; Sinergina; SR; Zentropil

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Phenytoin & Phenobarbital panel (S)Phenytoin and Phenobarbital panel - SerumPhenytoin & Phenobarbital pnl SerPhenytoin & Phenobarbital panelPANEL.DRUG/TOXPhenytoin & Phenobarbital panel, Blood-

Frequently asked questions

Code details

Code104596-2

SystemLOINC

Display namePhenytoin & Phenobarbital panel (S)

DescriptionPhenytoin & Phenobarbital panel

Short namePhenytoin & Phenobarbital pnl Ser

ComponentPhenytoin & Phenobarbital panel

Property-

TimingPt

System (specimen)Ser

Scale-

ClassPANEL.DRUG/TOX

StatusACTIVE

Order/ObservationOrder

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.78

Last changed2.78

Consumer names

Phenytoin & Phenobarbital panel, Blood

Part names

Phenytoin & Phenobarbital panel-PtSerPhenytoin and Phenobarbital panelPoint in time (spot)Serum

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.