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Haptoglobin blood test

Definition

The haptoglobin blood test measures the level of haptoglobin in your blood.

Haptoglobin is a protein produced by the liver. It attaches to a certain type of hemoglobin in the blood.

How the Test is Performed

A blood sample is needed.

How to Prepare for the Test

Certain medicines may affect the results of this test. Your doctor will tell you if you need to stop taking any medicines. Do not stop any medicine before talking to your doctor.

Drugs that can raise haptoglobin levels include:

  • Androgens
  • Corticosteroids

Drugs that can lower haptoglobin levels include:

  • Birth control pills
  • Chlorpromazine
  • Diphenhydramine
  • Indomethacin
  • Isoniazid
  • Nitrofurantoin
  • Quinidine
  • Streptomycin

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

Why the Test is Performed

This test is done to see how fast your red blood cells are destroyed. When red blood cells die, they release hemoglobin.

Haptoglobin attaches to this released hemoglobin, which is also called "free" hemoglobin. Free hemoglobin is not contained within red blood cells. The level of free hemoglobin is usually very low. But it rises when red blood cells are dying.

When the haptoglobin and hemoglobin attach, the new molecule goes to the liver. There, parts of it (such as iron and amino acids) are recycled. The haptoglobin is destroyed.

When red blood cells are actively being destroyed, haptoglobin disappears faster than it is created. Thus, the levels of haptoglobin in the blood drop.

Normal Results

The normal range is 41 - 165 mg/dL (milligrams per deciliter).

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

Higher-than-normal levels may be due to:

Lower-than-normal levels may be due to:

Risks

There is very little risk involved with having your blood taken. Veins and arteries vary in size from one patient to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight but may include:

  • Excessive bleeding
  • Fainting or feeling light-headed
  • Hematoma (blood accumulating under the skin)
  • Infection (a slight risk any time the skin is broken)

References

Schwartz RS. Autoimmune and intravascular hemolytic anemias In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine. 24th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 163.

Sheehan AM, Yee DL. Resources for the hematologist: interpretive comments and selected reference values for neonatal, pediatric, and adult populations. In: Hoffman R, Benz EJ Jr, Silberstein LE, et al., eds. Hematology: Basic Principles and Practice. 6th ed. Philadelphia, Pa: Elsevier Saunders; 2012:chap 164.


Review Date: 2/24/2014
Reviewed By: Todd Gersten, MD, Hematology/Oncology, Florida Cancer Specialists & Research Institute, Wellington, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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