A new equation for calculating a person's kidney function — their estimated glomerular filtration rate (eGFR) — worked as well with serum cystatin C as it did with serum creatinine as the biomarker.

‘Supine’ means lying on the back with the face pointing upward. Many people sleep in the supine position, and it is also common in certain practices, such as yoga and Pilates. For certain medical ...