LDH (lactate dehydrogenase) test
Quick answer: An LDH test measures an enzyme found in many body tissues; levels rise when cells are damaged. Doctors use it as a general marker of tissue damage, for example in anaemia caused by red cell breakdown, some infections and some cancers.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
- In fertility careIn pregnancy, LDH may be checked with other tests when HELLP syndrome is suspected.
How the test is done
- 1You are seated and your arm is supported
- 2The skin over a vein is cleaned
- 3Blood is drawn gently, as rough handling can damage cells and affect the result
- 4A cotton ball and plaster are placed on the spot
What your results can mean
Reading your report
Normal ranges differ between labs, so compare your result with the range printed on your report and discuss it with your doctor.
If the result is outside the usual range
A high LDH can be seen with tissue damage from many causes, including red cell breakdown (haemolysis), liver disease, muscle injury, some infections, HELLP syndrome in pregnancy and some cancers. Low levels are uncommon and rarely a concern.
Who usually has this test
People being checked for haemolytic anaemia, tissue damage or some cancers, and pregnant women when HELLP syndrome is suspected.
Risks and aftercare
Minor bruising at the needle site is possible and usually fades quickly.
Names and options
Also called: LDH, lactate dehydrogenase, serum LDH
Listed by the hospital as
- LDH LACTATE DEHYDROGENASE, SERUM
Questions about this test
What does a high LDH level mean?
A high LDH means cells somewhere in the body have been damaged and released the enzyme. Because LDH is found in many tissues, the test does not show where the damage is, so doctors use other tests to find the cause.
Can a blood sample give a falsely high LDH?
Yes. If red cells break during collection or handling, LDH from inside them can raise the result. If the result does not fit your condition, your doctor may ask for a repeat sample.
Why is LDH checked in pregnancy?
LDH is one of the tests used when HELLP syndrome is suspected, a serious complication linked with preeclampsia. It is read along with platelet count and liver enzymes.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.