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

C-Reactive Protein, Cardiac

A c-reactive protein test measures the level of c-reactive protein (CRP) in a sample of your blood. Your liver makes CRP in response to inflammation.

C-Reactive Protein (CRP) Test, MedlinePlus, National Library of Medicine

Primary unit
mg/L
LOINC codes
30522-7
Tests that measure C-Reactive Protein, Cardiac
Quest Diagnostics 3, Labcorp 2

Ranges

Compare the reference ranges labs publish with guideline targets, diagnostic cut-offs, study-based ranges and practitioner targets. Move across the rows to check a value against each range, and open a source from the legend. How to read these ranges

C-Reactive Protein, Cardiac, mg/L

Labs
Cut-offs
  • Lab reference ranges2 labs
  • Diagnostic cut-offs4 cut-offs
All 6 published ranges, with sources

Lab reference ranges

Diagnostic cut-offs

Tests

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

Quest Diagnostics 3 tests

Single-analyte tests

  • Cardio IQ® hs-CRP 91737

    Serum · Fasting not stated · Turnaround Set up: Mon-Fri

    Method and collection
    Method
    Immunoturbidimetric
    Reference notes
    ≤17 years Not established >17 years Optimal <1.0 mg/L Jellinger PS et al. Endocr Pract. 2017;23(Suppl 2):1-87. For ages >17 years hs-CRP (mg/L) Risk According to AHA/CDC Guidelines <1.0 Lower relative cardiovascular risk. 1.0-3.0 Average relative cardiovascular risk. 3.1-10.0 Higher relative cardiovascular risk. Consider retesting in 1 to 2 weeks to exclude a benign transient elevation in the baseline CRP value secondary to infection or inflammation. >10.0 Persistent elevation, upon retesting, may be associated with infection and inflammation.
    Quest Diagnostics catalog page

  • hs-CRP 10124

    Serum · Fasting not stated · Turnaround Set up: Mon-Fri (Night shift); Report available: 4 days

    Method and collection
    Method
    Immunoturbidimetric
    Reference notes
    ≤17 years | Not established >17 years | Optimal <1.0 mg/L Jellinger PS et al. Endocr Pract. 2017;23(Suppl 2):1-87. For ages >17 years hs-CRP (mg/L) | Risk According to AHA/CDC Guidelines <1.0 | Lower relative cardiovascular risk. 1.0-3.0 | Average relative cardiovascular risk. 3.1-10.0 | Higher relative cardiovascular risk. Consider retesting in 1 to 2 weeks to exclude a benign transient elevation in the baseline CRP value secondary to infection or inflammation. >10.0 | Persistent elevation, upon retesting, may be associated with infection and inflammation.
    Quest Diagnostics catalog page

Panels that include this biomarker

  • Cognitive Assessment Panel with Reflex to T4 Free 18634

    8 analytes · Serum · Fasting not stated

    Method and collection
    Method
    Spectrophotometry (SP) • Immunoturbidimetric • Enzymatic • Mass Spectrometry (MS) • Electronic Cell Sizing/Counting/Cytometry/Microscopy • Immunoassay (IA)
    Preparation
    Fasting is preferred Additional Considerations for Patient Preparation: Comprehensive Metabolic Panel: Administration of STRENSIQ may interfere in certain assays and may falsely elevate values. For patients receiving STRENSIQ, consideration should be given to using alternate methods. TSH: Specimen collection after fluorescein dye angiography should be delayed for at least 3 days. For patients on hemodialysis, specimen collection should be delayed for 2 weeks after angiography. According to the assay manufacturer Siemens: samples containing fluorescein can produce falsely depressed values. Folate: Dietary supplements containing biotin may interfere in assays and may skew analyte results to be either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.
    Collection
    Serum for Homocysteine: Red-top tubes: Place the specimen in a refrigerator or ice bath for 30 minutes after collection. Centrifuge the specimen as soon as possible after complete clot formation has taken place. Transfer the serum to a plastic screw-capped vial. Barrier gel separator tubes: Place the specimen in a refrigerator for 30 minutes after collection. Centrifuge the specimen as soon as possible after complete clot formation has taken place. Do not place barrier tubes in an ice bath as freezing may prevent the barrier gel from adequately separating serum from cells. Serum for other tests, 3 SSTs: Collect using standard venipuncture techniques. Separate from clot as soon as possible after visible clot formation, usually 30 minutes after collection. Whole blood, 1 EDTA: Maintain specimen at room temperature. Do not refrigerate. If multiple draw, collect lavender-top tube last. Traumatic venipuncture tap can introduce thromboplastin and trap white blood cells and platelets. Refrigeration can precipitate fibrin and trap white blood cells and platelets.
    Reference notes
    See Laboratory Report
    Quest Diagnostics catalog page

Labcorp 2 tests

Single-analyte tests

  • C-Reactive Protein (CRP), High Sensitivity (Cardiac Risk Assessment) 120766

    Serum · Fasting not stated · Turnaround Within 1 day

    Method and collection
    Method
    Immunochemiluminometric assay (ICMA)
    Collection
    Separate serum or plasma from cells within one hour of collection.
    Reference notes
    Average hs-CRP level:1 • Low risk: <1.00 mg/L • Average risk: 1.00−3.00 mg/L • High risk: >3.00 mg/L
    Labcorp catalog page

Panels that include this biomarker

  • Heart Disease and Stroke Risk Profile 500140

    4 analytes · Serum · Fasting not stated · Turnaround 2 - 5 days

    Method and collection
    Method
    See individual tests.
    Preparation
    Do not draw from an arm with a heparin lock or heparinized catheter.
    Collection
    Citrated plasma samples should be collected by double centrifugation. Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate.1 Evacuated collection tubes must be filled to completion to ensure a proper blood to anticoagulant ratio.2,3 The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood. A discard tube is not required prior to collection of coagulation samples, except when using a winged blood collection device (ie, "butterfly"), in which case a discard tube should be used.4,5 When noncitrate tubes are collected for other tests, collect sterile and nonadditive (red-top) tubes prior to citrate (blue-top) tubes. Any tube containing an alternate anticoagulant should be collected after the blue-top tube. Gel-barrier tubes and serum tubes with clot initiators should also be collected after the citrate tubes. Centrifuge for 10 minutes and carefully remove 2/3 of the plasma using a plastic transfer pipette, being careful not to disturb the cells. Deliver to a plastic transport tube, cap, and recentrifuge for 10 minutes. Use a second plastic pipette to remove the plasma, staying clear of the platelets at the bottom of the tube. Transfer the plasma into a Labcorp PP transpak frozen purple tube with screw cap (Labcorp No. 49482). 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. Please print and use the Volume Guide for Coagulation Testing to ensure proper draw volume.
    Labcorp catalog page

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Goals and conditions

We link C-Reactive Protein, Cardiac to these goals and conditions from named guidelines and studies.

Sources

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.

Interpret your own results with a licensed clinician, or track your lab history and health goals in Aumnivida.

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