Since blood and daily urine excretion of creatinine shows minimal fluctuation, creatinine excretion is useful in determining whether 24-hour urine specimens for other analytes (e.g., protein) have been completely and accurately collected. To view specimen requirements and codes please Select a regional laboratory.
Ultrasound is almost foolproof at diagnosing twins, but the greater the number of babies, the less accurate the ability to detect how many there are. It's possible to see twins (or more) on a scan at around six weeks, though one baby may be missed at this early stage. Sometimes a heartbeat is seen in one sac, but not in the other. Rescanning in a week or two may reveal a second heartbeat, or the scan may show that one sac is growing and the other still empty.
Twins, triplets or more do tend to arrive ahead of schedule. About 57 per cent of twins and almost all triplets are born at or before 37 weeks. Some twins are born at 40 weeks (full-term for a single baby), or even later.But 37 weeks is considered to be full-term for a twin pregnancy.Most twins who arrive early are born between 32 weeks and 37 weeks. Only 10 per cent of twins arrive before 32 weeks.Babies who are born between 32 weeks and 37 weeks generally do very well. However, your premature babies may need to spend some time in special care after they are born.wins, triplets or more do tend to arrive ahead of schedule. About 57 per cent of twins and almost all triplets are born at or before 37 weeks. Some twins are born at 40 weeks (full-term for a single baby), or even later.