Osmolality measures the amount of dissolved substances (e.g., sodium, potassium) in blood and urine. An osmolality test and calculated osmolal gap help determine if someone has ingested a toxin or has a water imbalance.
Ketones (ketone bodies) are byproducts of fat metabolism, and blood ketones tests are primarily used to screen for, detect, and monitor a serious, sometimes life-threatening condition called diabetic ketoacidosis (DKA).
Chromogranin A (CgA) is released from neuroendocrine cells throughout the body. This tumor marker test is used in the management of neuroendocrine tumors.