Karyotyping by G-Banding, Peripheral Blood

Karyotyping is carried out to:

• To determine whether an adult's chromosomes contain an alteration that might be passed on to a child.
• See if a chromosome defect prevents a woman from getting pregnant or if it causes miscarriages.
• Check to see if a fetus has a chromosomal defect.
• Karyotyping can also determine whether chromosomal issues led to the fetus's stillbirth.
• Find the cause of any congenital disabilities or disabilities in a newborn.
• Assist in determining the best course of treatment for certain cancers.
• Patients with infertility (both male and female), poor obstetric history, puberty-related difficulties, or a family history of specific genetic illnesses may need to undergo chromosomal analysis. If infants or early toddlers exhibit evidence of intellectual incapacity or congenital malformations, a chromosomal study may be necessary. There are some blood malignancies and diseases for which this test may be used.

A karyotype test evaluates the shape, size, and number of chromosomes, which are parts of the cells containing genes. Genes are parts of DNA passed down from one's mother and father. It is usually performed to detect genetic abnormalities that a developing baby has.

This test is useful for the following reasons:

• To find trisomies, monosomies, etc.
• Determine the number of chromosomes.
• Check for chromosome structural alterations, such as deletions, duplications, translocations, etc.

Karyotyping test requires a blood sample. A tourniquet (elastic) band is placed tightly on the upper arm. The patient is then asked to make a fist. This helps in the build-up of blood filling the veins. The skin is disinfected before needle insertion and the blood sample is collected in vacutainer.

Adults may need Karyotyping testing if they:

• Have issues getting pregnant or their partner pregnant. Occasionally infertility in men or women can be caused by a genetic defect.
• Have certain blood disorders or cancers. Chromosome changes can occur due to illnesses, including multiple myeloma, lymphoma, leukaemia, or anaemia. Karyotyping can detect these anomalies and help with treatment.
• Have a family history of particular genetic illnesses. Chromosome analysis can reveal whether one has abnormal chromosomes and how likely it is to be passed on to offspring.

Abnormal results from a Karyotyping by G-Banding Peripheral Blood test can indicate the presence of chromosomal abnormalities. These abnormalities can come in two forms: numerical (number of chromosomes) or structural (arrangement of chromosomes).

Here's a breakdown of what abnormal results might mean:

• Numerical abnormalities: This includes having too many (trisomy) or too few (monosomy) chromosomes. Common examples include Down syndrome (Trisomy 21) or Turner syndrome (monosomy X). These can lead to a variety of health issues depending on the specific chromosome affected.
• Structural abnormalities: This refers to changes in the structure of a chromosome, such as a deletion, duplication, translocation (where a piece of one chromosome is attached to another). These can also cause a range of health problems, depending on the specific abnormality and the genes involved.

• When a woman experiences miscarriage or infertility, when a newborn has congenital abnormalities, when an adult exhibits symptoms of a genetic condition, or when a fetus is suspected to have a chromosomal abnormality, chromosome analysis may be prescribed.
• When a chromosomal issue has been identified in a kid or another family member, other members of the family may also be requested to go for chromosome test.
• When a person has leukemia, lymphoma, myeloma, refractory anemia, or other forms of cancer, it may be required to look for acquired chromosomal abnormalities.
• If the family history has a known chromosomal abnormality.

There are no specific preparations required for the test. However, it is recommended that you consult with your healthcare provider before taking the test, as they may have specific instructions or recommendations based on your individual medical history and current health status.

Depending on the results, doctors may recommend other forms of genetic testing for further prognosis.

• G-Banding
• Chromosome Analysis
• Karyotype Genetic Test

The two common types of Karyotyping are Product of Conception (POC) and Couple Karyotyping. It aids in the identification of any chromosomal abnormalities in fetuses and parents.

1. POC Karyotyping It is carried out using samples taken from a miscarried fetus. If the doctor suspects any chromosome abnormalities, they may advise you to do POC karyotyping on the fetus from the lost pregnancy. The other name for POC karyotyping is chromosomal analysis.
2. Couple Karyotyping The couple karyotyping is performed on both partners. Chromosome abnormalities are detected using blood samples. However, this can be done with a single partner as well. If the test is conducted on the mother, it is referred to as Karyotyping Single.