Essay by Jodi Frances Abbott. The views expressed are the opinions of the author.

There are two medications that prevent preterm birth, the most common cause of perinatal death in the United States. One costs 16 cents a week, one $285 a week. Poor black women aren’t getting either. Why?

In 2015, for the first time in eight years, the rate of preterm birth in the United States rose, despite increased understanding of preventive measures. Preterm births cost Americans an estimated $26 billion per year.

Additionally, U.S. maternal death rates are the among the worst for economically similar countries — twice those of Canada and Spain and almost three times as high as in Japan.

When the rates are examined more closely, they reveal an alarming narrative about differences in health outcomes that are systemic, avoidable and unjust.

As an obstetric provider for women with high-risk pregnancies at Boston Medical Center, the largest safety-net hospital in New England, I witness the tragic outcomes of these health inequities every day. As an investigator tasked with reducing them, I lead teams who have identified several important barriers to access.

One potentially preventable cause of preterm birth is recurrent spontaneous preterm birth. That’s when babies deliver early, despite attempts to prevent it, to mothers who have a history of early deliveries from the same cause.

Both the Society of Maternal-Fetal Medicine and the American College of Obstetricians and Gynecologists recommend a specific progesterone preparation called 17P. This medication can reduce recurrent preterm birth in women with a history of spontaneous preterm birth.

Currently, it’s available only at high cost, between $225 and $385 per week. The cost has profoundly affected obstetric providers’ ability to obtain 17P for all eligible women, and it contributes to the increased incidence of spontaneous preterm birth in black women.

Most health insurers who enroll low-income and urban women require prior authorization or numerous additional communications. These hurdles can be daunting, especially for anyone with competing financial needs and language or literacy challenges.

In Louisiana, a state with one of the highest rates of preterm birth, only 5 percent of women who should be getting this medication are able to obtain it.

Our patients were not routinely informed that they had delivered preterm and were at risk of recurrence.

In fact, we found that none of our patients delivering preterm had documented counseling about their diagnosis or recommendations for future pregnancy during their hospitalization for that first preterm baby. Without this information, they were unaware of the risk to their next pregnancy or that they could reduce risk by asking in prenatal care for 17P.

17P is expensive, so perhaps it seems reasonable for insurers to restrict it, even from those who qualify for its benefit.

But what about other preventable causes of preterm birth? Maternal complications of high blood pressure, also known as preeclampsia, can also induce preterm birth.

Preeclampsia, a disease of constriction of small blood vessels, costs an estimated $2.1 billion per year in the United States. This is at a time when the poorest women in America are at rising risk of maternal death, of which preeclampsia is a leading contributor.

A medication that costs 16 cents a week is also unavailable to many of the women most likely to benefit. This magical treatment is low-dose, or “baby,” aspirin.

In 2014, the U.S. Preventive Services Task Force, a congressionally authorized independent group of national experts, officially recommended low-dose aspirin for pregnant women at high risk of preeclampsia.

Aspirin in highest-risk women may reduce preterm birth by 62 percent. It can also cut the overall incidence of hypertensive pregnancy complications in half.

Low-dose aspirin has been used safely for both mothers and babies for more than 80,000 pregnancies over 30 years.

Our goal is for 90 percent of qualified women to get this benefit.

Why aren’t women, especially high-risk women, getting this medication?

At Boston Medical Center, we are working to address our three specific identified barriers to access: Providers are reluctant to prescribe low-dose aspirin, pharmacists are reluctant to fill it, and, when prescribed, women are afraid to take it.

Though it hasn’t been fully studied, reluctance on the part of providers and pharmacists probably stems from a lack of knowledge or acceptance about risk factors. Meanwhile, women, eager to have a safe pregnancy, are bombarded by mixed messaging when searching online for information about aspirin in pregnancy.

The medical community can do better to reduce this racial disparity, but doing so requires focused interventions directed toward those women most likely to benefit.

At our hospital, we were able to increase our patients’ access rate to 17P to almost 90 percent. We focused on four specific barriers: lack of patient knowledge, lack of provider awareness, suboptimal communication in the electronic health record, and insurance challenges in obtaining the medication. This subsequently reduced our preterm birthrate by 62 percent.

At a time when reproductive-health-care sites are being closed and preventive-care restrictions on poor women are implemented daily, we need to prioritize every woman’s access to interventions that reach high-risk women in order to prevent infant mortality and preterm birth.