In those with symptoms and clinical signs of rheumatoid arthritis, the presence of significant concentrations of RF indicates that it is likely that they have RA. Higher levels of RF generally correlate with more severe disease and a poorer prognosis. A negative RF test does not rule out RA.
Macrosomia (big baby). The average newborn weight is about 3.4 kilograms (kg) / 7 pounds (lb) 8 ounces (oz). Babies weighing more than 4.5kg/ 9lb 15oz at birth are considered much larger than average or macrosomic, which literally means of large body.It's very difficult to determine whether a baby is truly macrosomic while still in the uterus (womb) - only the post-birth weight confirms this.abies weighing more than 4.5kg/ 9lb 15oz at birth are considered much larger than average or macrosomic, which literally means of large body. It's very difficult to determine whether a baby is truly macrosomic while still in the uterus (womb) - only the post-birth weight confirms this.
The average newborn weighs about 3.4kg (7lb 8oz). Babies weighing more than 4kg (8lb 13oz) at birth are considered larger than average, or macrosomic (NCCWCH 2008, RCOG 2012) . If you have a very large baby, weighing 4.5kg (9lb 15oz) or more, it can put you and your baby at greater risk of certain complications.n ultrasound scan can give an idea of how big your baby really is. However, bear in mind this is not always accurate in later pregnancy. There can be a difference of about 10 per cent between your baby's weight predicted by ultrasound, and his actual weight at birth (RCOG 2012) .