Biomarker Lens

Common biomarkers

  • Hemoglobin
  • Glucose
  • ALT
  • Apolipoprotein B
  • C-Reactive Protein, Cardiac
  • Ferritin
  • Alb/Creat Ratio, Urine
  • Alkaline Phosphatase
  • FSH
  • T4,Free(Direct)

Biomarkers · Chemical

Complement C4a

Primary unit
ng/mL
LOINC codes
4501-3
Tests that measure Complement C4a
Labcorp 2, Quest Diagnostics 1

Tests

Check the catalog code, specimen, method and preparation for every test that measures Complement C4a. Select up to five tests to compare them side by side.

Labcorp 2 tests

Single-analyte tests

  • Complement C4a 004330

    Plasma · Fasting not stated · Turnaround 4 - 7 days

    Method and collection
    Method
    Radioimmunoassay (RIA)
    Preparation
    No radioactive isotopes administered within 48 hours prior to venipuncture.
    Collection
    Collect EDTA whole blood sample into a chilled lavender-top tube. Immediately add Futhan preservative as directed in the Futhan collection kit (LabCorp N° 78946). Recap lavender tube and invert several times to mix well. Centrifuge the whole blood specimen to separate the plasma. Transfer the plasma into the plastic screw-cap tube that is included in the collection kit. The specimen must be submitted in this transfer tube, which is labeled with the words "Futhan Added." Freeze immediately and maintain frozen until tested. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.
    Reference notes
    Males: 152.0–1559.4 ng/mL Females: 215.7–2025.9 ng/mL
    Labcorp catalog page

Panels that include this biomarker

  • Lupus Monitor Profile 505770

    6 analytes · Serum · Fasting not stated · Turnaround 3 - 5 days

    Method and collection
    Method
    See individual components.
    Labcorp catalog page

Quest Diagnostics 1 test

Single-analyte tests

  • Complement Component C4a, Plasma 13555

    Plasma · Fasting not stated · Turnaround Set up: Mon, Wed, Sat

    Method and collection
    Method
    Enzyme Linked Immunosorbent Assay (ELISA)
    Collection
    Collect whole blood into EDTA (lavender-top) tube. Centrifuge and pour 1-2 mL plasma carefully into protease inhibitor transport tube. (Note gradations on side of tube.) Freeze and transport on dry ice.
    Reference notes
    ≤1028 ng/mL
    Quest Diagnostics catalog page

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Sources

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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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