Insulin blood test
Quick answer: An insulin test measures the level of insulin, the hormone that moves sugar from blood into cells. Doctors order it to look for insulin resistance, for example in PCOS, or to investigate low blood sugar episodes.
- SampleBlood
- TakesAbout 5 minutes
- Before the testFor a fasting sample, fast for 8 to 12 hours; for a post-meal sample, give blood at the time after eating that your doctor advises.
- In fertility careInsulin resistance is common in PCOS and can affect ovulation.
How the test is done
- 1You usually fast overnight for 8 to 12 hours
- 2A needle draws blood from a vein in the morning
- 3Glucose is often measured from the same sample
- 4The lab measures insulin
What your results can mean
Reading your report
Ranges differ between labs and depend on timing, so discuss your result with your doctor.
If the result is outside the usual range
A high fasting level can be seen with insulin resistance, such as in PCOS, being overweight or prediabetes. A low level can be seen with type 1 diabetes; a high insulin with low sugar can point to a rare insulin-making tumour.
Who usually has this test
Women with PCOS, people with suspected insulin resistance, and people with unexplained low blood sugar episodes.
Risks and aftercare
Have breakfast once the sample is taken.
Names and options
Also called: fasting insulin, PP insulin, serum insulin
Options
- Fasting
- Post-meal (PP)
- Random
Listed by the hospital as
- INSULIN, SERUM (RANDOM)
- INSULIN POST PRANDIAL
- INSULIN FASTING
Questions about this test
Why is insulin tested in PCOS?
Many women with PCOS have insulin resistance, which can make ovulation less regular. Knowing this helps guide lifestyle and treatment choices.
Does an insulin injection affect the test?
Yes. The test measures insulin from injections as well as your own. C-peptide is used to check your own insulin.
Is there a standard normal range for insulin?
Ranges vary between labs and methods. Your doctor reads it with your glucose and symptoms.
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.
Get directions ↗IVF Pulse fertility care at Tamara Hospital →
Reception
Waiting area
IVF lab
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.