VEGFD and lymphangioleiomyomatosis: In a woman with a compatible chest CT, a serum VEGF-D concentration of more than 800 pg/mL eliminates the need for an invasive lung biopsy, concentrations between 600 and 800 pg/mL are highly suspicious for LAM, and values of less than 600 pg/mL are considered uninformative and do not exclude LAM [5].