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Michelle Kuppersmith's doctor recommended a bone marrow biopsy after suspecting she had a rare blood disorder. Though the biopsy was done by an in-network provider at an in-network hospital, Kuppersmith learned she was on the hook for $2,400 for out-of-network genetic profiling. Shelby Knowles for KHN hide caption

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Shelby Knowles for KHN

Workers use a tape measure mark spaces six feet apart for people to wait in line safely as they convert the outdoor plaza in front of Zaytinya, one of Chef José Andres' restaurants in Washington, D.C. Efforts to contain the coronavirus are affecting blood donor drives and supplies. Chip Somodevilla / Getty Images hide caption

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Chip Somodevilla / Getty Images

Researchers have identified waves of proteins in blood that peak at three distinct stages of life. What do the findings mean for aging? ER Productions Limited/Getty Images hide caption

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ER Productions Limited/Getty Images

Scientists Find Surprising Age-Related Protein Waves In Blood

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A blood transfusion bag hangs in an operating room in a hospital in the Republic of Congo. Most countries in sub-Saharan Africa have a huge gap between blood supply and demand, new research found. Godong/Universal Images Group/Getty Images hide caption

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Godong/Universal Images Group/Getty Images

The red drop of blood (left) was designated as an official emoji to symbolize menstruation, among other things, this year. The design at right, submitted in 2017, was not accepted. Unicode; Plan International UK hide caption

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Unicode; Plan International UK

The prehensile tailed skink from the highlands of New Papua New Guinea has green blood due to high concentrations of the green bile pigment biliverdin. The green bile pigment in the blood overwhelms the intense crimson color of red blood cells resulting in a striking lime-green coloration of the muscles, bones, and mucosal tissues. Courtesy of Christopher C. Austin/LSU hide caption

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Courtesy of Christopher C. Austin/LSU

Why Do Some Lizards Have Green Blood?

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Blood quantum was initially a system that the federal government placed onto tribes in an effort to limit their citizenship. Leigh Wells/Getty Images/Ikon Images hide caption

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Leigh Wells/Getty Images/Ikon Images

So What Exactly Is 'Blood Quantum'?

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