Science · Menstrual blood

Every month, the body delivers a sample no needle can reach.

Menstrual blood is three samples in one: systemic blood, vaginal fluid and tissue from the lining of the uterus. A new sample type with unique access, not a replacement for every test.

Diagram of the female reproductive system next to a drop of menstrual blood. Endometrial tissue comes from the uterus, systemic blood from its vessels, and vaginal fluid from the vagina; all three end up in menstrual blood.
Where each part comes from: the uterine lining, the circulation, and the cervix and vagina.

Three samples in one

Systemic blood

For validated analytes, menstrual blood reads like a venous draw, without the needle. HbA1c monitoring is FDA cleared.

Vaginal fluid

Vaginal fluid travels out with menstrual blood, and with it signs of HPV: testing without a speculum.

Endometrial tissue

The only sample that brings the lining of the uterus out of the body every month, without a biopsy.

Reviewed by the Qvin science team, .