LOINC Code 93866-2: C4 nephritic factor Ql

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 C4 nephritic factor. 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

What it does not mean

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

Key facts

• C4 nephritic factor [Presence] in Serum or Plasma
• C4 nephritic factor
• C4 nephritic factor (C4Nef) levels in serum or plasma are measured as part screening patients with C3 glomerulopathy (C3G), a group of rare complement-mediated kidney diseases.
• C4 NeF; C4NEF; Complement.C4 Nephritic; Fac; Fact; HEMATOLOGY/CELL COUNTS; Ordinal; Pl; Plasma; Plsm; Point in time; PR; QL; Qual; Qualitative; Random; Screen; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR

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

Frequently asked questions