Karyotype
karyotype test · chromosome analysis · karyotyping · chromosome blood test
This is a blood test from a vein. The lab counts and looks at your chromosomes, which carry your genetic information.
For infertility, repeated miscarriages, before IVF, or if a child may have a genetic condition.
⏱ Duration: the blood draw takes 3 to 5 minutes; results usually come in 2 to 4 weeks
Be sure to tell your doctor
How to prepare
- Health. It is best to test when you are well. If you were recently ill, ask your doctor when to come.
- Food. Usually no need to fast, but avoid fatty food before the test. Check with the lab.
- Medicines. Do not stop them on your own. Tell your doctor what you take.
What to bring
- Your test request form
- Your ID
- Past genetic test results, if you have them
How it goes
- You sit down and rest your arm on the armrest
- A band is tightened above your elbow, and the skin is wiped
- Blood is drawn into a special tube
- The needle comes out, and a cotton pad is pressed on
What you'll feel
- A quick prick, like a pinch
Afterwards
- Press the cotton pad for 3 to 5 minutes
- Results usually come in 2 to 4 weeks, because the cells need to be grown
- It is best to discuss the result with a geneticist
Common questions
Why does the test take so long?
Blood cells are grown for several days. Then their chromosomes are studied under a microscope.
If my karyotype is normal, does that mean no genetic problems?
Not always. A karyotype shows large changes. Smaller ones are found with other tests, if needed.