This test is aslo known as INHBA.
To assess the risk of having a baby with certain chromosomal disorders, such as Down syndrome (trisomy 21) or Edwards syndrome (trisomy 18), or open neural tube defects, such as spina bifida.
Inhibins are heterodimeric protein hormones secreted by granulosa cells of the ovary and Sertoli cells of the testis. They selectively suppress secretion of pituitary follicle stimulating hormone (FSH) and have local paracrine actions in the gonads. The inhibins consist of a dimer of 2 homologous subunits, an alpha subunit and either a beta A or beta B subunit, to form inhibin A and inhibin B, respectively.
In females, inhibin A is primarily produced by the dominant follicle and corpus luteum: whereas inhibin B is predominantly produced by small developing follicles. Serum inhibin A and B levels fluctuate during the menstrual cycle. At menopause, with the depletion of ovarian follicles, serum inhibin A and B decrease to very low or undetectable levels.
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The inhibin A test is done to measure the amount of this hormone in a pregnant woman's blood to see if the baby may have Down syndrome. Inhibin A is made by the placenta during pregnancy.
No special preparations required.
None
2 to 3 business days
A blood sample drawn from a vein in your arm known as "Vanipuncture".
Sample report in a format
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