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

Hemoglobin, Free, Plasma

A hemoglobin test measures the levels of hemoglobin in your blood. Hemoglobin is an iron-rich protein in your red blood cells.

Hemoglobin Test, MedlinePlus, National Library of Medicine

Primary unit
mg/dL
LOINC codes
721-1
Tests that measure Hemoglobin, Free, Plasma
Labcorp 1, Quest Diagnostics 1

Tests

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

Labcorp 1 test

Single-analyte tests

  • Hemoglobin (Hb), Free, Plasma 005595

    Plasma · Fasting not stated · Turnaround 3 - 4 days

    Method and collection
    Method
    Based on the catalytic action of hemoglobin on the oxidation of TMB by hydrogen peroxide; rate measured by spectrophotometry
    Preparation
    Patient should not exercise just prior to the test.
    Collection
    Recommended procedure for collecting sample without inducing hemolysis: An 18-gauge needle with attached infusion tubing is used. Place the tourniquet lightly around the upper arm. Puncture an antecubital vein with as little trauma as possible. Release the tourniquet and clamp the tubing off as soon as blood return is seen. First collect 3 mL blood in a red-top tube with the rubber top off. Then, collect 5 mL in an anticoagulated tube with the top off. Clamp the tubing, withdraw the needle, and apply a pressure bandage to the site until residual bleeding is stopped. Recap the anticoagulant tube and gently mix three to five times. This specimen is used for the plasma hemoglobin determination. Centrifuge and separate plasma from red cells immediately following collection and transfer plasma to a transfer tube.
    Reference notes
    <5 mg/dL (if conditions are optimal). Values obtained between 5−15 mg/dL should be interpreted with caution since such variables as suboptimal venipuncture may increase results to this range.
    Labcorp catalog page

Quest Diagnostics 1 test

Single-analyte tests

  • Hemoglobin, Free, Plasma 514

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

    Method and collection
    Method
    Colorimetry (C)
    Collection
    Centrifuge plasma within 1 hour of collection. Transfer the plasma to a sterile transport tube.
    Reference notes
    <8.4 mg/dL
    Quest Diagnostics catalog page

0 of 5 tests selected

Pick one more

Sources

Check the guidelines, studies and lab catalogs behind every range and link on this page. Open a source to see each claim it backs.

Lab catalogs

Reference sources

Codes and registries

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.

Spotted an error? Email hello@biomarkerlens.com with the page URL and the primary source that corrects the entry.