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LOINC Code 73994-6: Polychlorinated biphenyl (PCB) Screen Ql

73994-6 is a LOINC code used to identify Polychlorinated biphenyl (PCB) Screen Ql 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 Polychlorinated biphenyl. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Polychlorinated biphenyl. It is commonly used with the system or sample type Ser/Plas.

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: Both
  • Method: Screen

What it does not mean

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

Key facts

  • Polychlorinated biphenyl (PCB) [Presence] in Serum or Plasma by Screen method
  • Polychlorinated biphenyl
  • Qualitative screening analysis for polychlorinated biphenyl (PCB) mixtures. The submitting lab's screening threshold is 0.2 ng/mL. Results greater than 0.2 ng/mL are considered positive. Testing is performed to determine environmental or workplace exposure to PCBs.
  • 1,1'-Biphenyl; Bibenzene; Biphenyls; Diphenyl; DRUG/TOXICOLOGY; Drugs; Lemonene; Ordinal; PCB; PCBs; Phenylbenzene; Pl; Plasma; Plsm; Point in time; Polychlorinated biphenyls; PR; QL; Qual; Qualitative; Random; Scn; Scr; Screen; Scrn; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Tetrosin LY

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

Polychlorinated biphenyl (PCB) Screen QlPolychlorinated biphenyl (PCB) [Presence] in Serum or Plasma by Screen methodPCB SerPl Ql ScnPolychlorinated biphenylDRUG/TOXPolychlorinated Biphenyl (PCB), BloodPrThr

Frequently asked questions

Code details

Code73994-6
SystemLOINC
Display namePolychlorinated biphenyl (PCB) Screen Ql
DescriptionPolychlorinated biphenyl
Short namePCB SerPl Ql Scn
ComponentPolychlorinated biphenyl
PropertyPrThr
TimingPt
System (specimen)Ser/Plas
ScaleOrd
MethodScreen
ClassDRUG/TOX
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.46
Last changed2.73

Consumer names

Polychlorinated Biphenyl (PCB), Blood

Part names

Polychlorinated biphenylPrThrPtSer/PlasOrdScreenPolychlorinated biphenyl (PCB)Presence or ThresholdPoint in time (spot)Serum or PlasmaToxicology screen

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.

LOINC Code 73994-6 | HealthAssure