The heparin anti-Xa test is not routinely ordered but may be performed whenever a doctor wants to evaluate UFH or LMWH concentrations in the blood.It may be ordered periodically to monitor UFH therapy, especially when a doctor feels that a person is not responding as expected to UFH or when the PTT is not useful.he heparin anti-Xa test is not routinely ordered but may be performed whenever a doctor wants to evaluate UFH or LMWH concentrations in the blood.
Also known as urochrome, urobilins are the pigment that gives urine its yellow color. Urine is usually pale yellow, but it can range from clear to a deep amber color in a healthy person. The level of yellow is determined by how hydrated a person is.
Colorless Urine And Kidney Disease 2013-04-09 17:53. Due to urochrome, the normal urine color can range from pale yellow to deep amber. Abnormal urine color can be caused by foods, drugs, pigment, blood, urinary tract infection, kidney problems and other factors. Urine color has much to do with fluid intake. The more water we drink, the more light the color is.