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Luteinizing Hormone (LH) in Serum/Plasma

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of luteinizing hormone in your blood. LH is a hormone produced by the pituitary gland that plays a key role in reproductive health, including ovulation in women and sperm production in men.

Quick summary

["LH helps regulate important reproductive functions and may be checked for fertility issues or hormonal imbalances."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
32326-1
Short code
LH 30M p chal SerPl-aCnc
Synonyms
LH 30M p chal SerPl-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
1.5
Ref high
9
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
83002
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order an LH test to diagnose or monitor conditions such as infertility, hormonal imbalances, or to check for signs of conditions like polycystic ovary syndrome (PCOS) in women. It may also be used to evaluate pituitary gland function or to monitor treatment for hormonal disorders.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it involves drawing blood from your arm. If you’re taking medications that affect hormones, let your provider know.

During the Test

A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a brief pinch, but the procedure is quick and usually not painful. You’ll rest for a few minutes afterward.

What the Results Mean

Results are interpreted based on your age, sex, and medical history. High or low LH levels can indicate different conditions, so your provider will discuss findings with you after the test.

Reference range

Follicular: 1.5-9.0 mIU/mLN/A

Specimen: serum

For females: inform if menstrual cycle status. For certain tests, timing within menstrual cycle may matter.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

LH Test

Frequently asked questions

How often will I need this test?
The frequency depends on your health needs. Some people get LH tests once or twice a year, while others may need them more often if they’re undergoing fertility treatments or managing a chronic condition.
What do my LH test results mean if they’re outside of normal ranges?
If your results are higher or lower than expected, your provider will explain what it might mean in the context of your health. They may recommend further testing or adjustments to your treatment plan.
Can lifestyle changes affect LH levels?
Yes, factors like stress, weight, exercise, and certain medications can influence LH levels. Making healthy lifestyle choices—such as managing stress, maintaining a healthy weight, and avoiding smoking—may support balanced hormone function.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy