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Family Forum / Pregnancy / Pregnancy / October 2004Best time for PKU testing?
Ericka, Elfanie, anyone else with sources/thoughts on this? When is the most optimal time to have the PKU test done on a newborn? I know it needs to be done after a certain amount of time so that the newborn has had something in his/her system, but how about *optimal?* Our midwives' letter says the baby is to have a pediatrician visit a day after our planned homebirth, but that seems a little nutty. I've discussed it with the ped a bit, and she agrees that 24 hours after birth is not necessary, unless there seems to be a problem, and that 24 hours isn't enough for the PKU test anyway. With our first baby, the PKU test was done in our home almost exactly 48 hours after the birth (by an RN from the birth center), and the first ped visit was about 74 hours after birth. I'm thinking somewhere between 24 hours/2 days and 4 days after birth would be the best time for a visit to the ped, because by then my milk should be in, I should have a clue as to how nursing is going, and the PKU test would be accurate. But if I have the choice about it, is there an absolute best time at which the PKU should be done? TIA! -Sara:) Mommy to one lovely daughter and her baby sibling, due in 14 weeks! My midwife will be coming home 3 days after I get back home after delivery to do the test. Which means, if I stay there for the full 24 hours after birth, the test will be done 4 days after birth. Less if I decide to go home earlier. After talking with my endocrinologist, he stated that as far as thyroid problems are concerned, intervention is necessary within 6 weeks if there is a problem, and that tests are routinely done between 3 days and a week after birth. So I guess "absolute best time" would be within a week... > Ericka, Elfanie, anyone else with sources/thoughts on this? When is > the most optimal time to have the PKU test done on a newborn? I know [quoted text clipped - 18 lines] > -Sara:) > Mommy to one lovely daughter and her baby sibling, due in 14 weeks! I have a suspicion ours was done on day 7, we saw an on call midwife over the weekend, then on Monday our regular midwife said she would do it the next day, but she was at a delivery, so we did it the following day.. ..just found the piece of paper, that's right 7 days later, test was taken 4th June, N was born 28th May : Ericka, Elfanie, anyone else with sources/thoughts on this? When is : the most optimal time to have the PKU test done on a newborn? I have heard 6 days. Don't have cites. Larry > Ericka, Elfanie, anyone else with sources/thoughts on this? When is > the most optimal time to have the PKU test done on a newborn? I'm just quoting what it says in the Well Child booklet we are given. Between 2 and 5 days for the heel prick test. And then next to it, I see that my daughter's was done 8 days after birth! Hmm. Cathy DD 8 Jan 03 EDD 8 Dec 04 > Ericka, Elfanie, anyone else with sources/thoughts on this? When is > the most optimal time to have the PKU test done on a newborn? For the *most* accurate answer to this question, you need to contact the lab that will be doing the screening. In some cases a particular disorder can be screened for in different ways and the timing is different depending on which way. In general, however, the ideal time is usually between 1 and 6 days. Sooner in that range is usually better in that it is optimal to start treatment very early for some problems. PKU tends to be one of the tests that is more sensitive to timing, and the baby needs to have ingested some protein before the test, but my understanding is that current tests don't require your milk to have come in to be reasonably accurate. Best wishes, Ericka > Ericka, Elfanie, anyone else with sources/thoughts on this? When is > the most optimal time to have the PKU test done on a newborn? I know [quoted text clipped - 13 lines] > have the choice about it, is there an absolute best time at which the > PKU should be done? Our hospital said after 48 hours and before one week. They were going to test Claire at 24 hours but then told us we'd have to get it redone after 48 hours at our ped, so we declined the hospital test. Mary >Ericka, Elfanie, anyone else with sources/thoughts on this? When is >the most optimal time to have the PKU test done on a newborn? I know [quoted text clipped - 13 lines] >have the choice about it, is there an absolute best time at which the >PKU should be done? It's done on day 3 of your hospital stay in Australia (assuming you stay that long). If it's not done on day 3 in hospital the midwife does it when she comes to your house within the first week. I gather the baby needs to have taken in a sufficient amount of milk for the problems to show up in the blood so day 3 seems pretty optimal since that's when most women are starting to see their milk change from colostrum to mature milk.  SignatureCheryl Mum to Shrimp (11 Mar 99), Thud (4 Oct 00) Mischief (30 Jul 02) + Thumper due Feb 05 Oh gosh, 14 weeks seems so soon. I am having a hot flash, because we are due near each other and I am coasting on what is hopefully a litter bit of a longer sail! Onto the PKU. hmmmm, I think we used to due 12hours after birth just as a simple rule. Most babies have had a decent amount of intake at that point and it was easy to time and to have parents expect the test........don't know what they do now. The birth center I worked for *years* ago did the first PKU at the day after home visit. Kelly #4 2/12/05 > Ericka, Elfanie, anyone else with sources/thoughts on this? When is > the most optimal time to have the PKU test done on a newborn? I know [quoted text clipped - 18 lines] > -Sara:) > Mommy to one lovely daughter and her baby sibling, due in 14 weeks! >> Ericka, Elfanie, anyone else with sources/thoughts on this? When is >> the most optimal time to have the PKU test done on a newborn? Different states test for different things, so the answer might vary depending on what disorders they are looking for. As I recall, my son had two PKU tests, one in the hospital and again at the midwife's office at a week or two old. That might be because the hospital test was messed up for some reason, though, I am not sure. --Helen It is normal/standard here to have the PKU in the hospital and again at the 2 week peds appt. Kelly #4 2/12/05 > >> Ericka, Elfanie, anyone else with sources/thoughts on this? When is > >> the most optimal time to have the PKU test done on a newborn? [quoted text clipped - 6 lines] > > --Helen > Ericka, Elfanie, anyone else with sources/thoughts on this? This recently came up at work, and we got documentation from our lab. The full neonatal screening test (including PKU, or Guthrie) can be done at 24 hours, REGARDLESS of weather milk feeds have commenced. Feeding type must be indicated on the card, though. The tests are now much more sensitive than they used to be, so even if a baby is fasted and on a drip for the first 24 hours, it is still possible to get an accurate result, so long as you've noted it on the card for the blood sample. This is in Australia though (WA), so I don't know about the U.S. HTH Jo (RM) It is standard for it to be done at 5 days old here in NZ. I know they like them to have had at at least 48 hours of breastmilk (not sure the reason for this) so 24 hours seems much too soon. SignatureAmy, Mum to Carlos born sleeping 20/11/02, & Ana born screaming 30/06/04 email: barton . souto @ clear . net . nz (join the dots!) http://www.babiesonline.com/babies/c/carlos2002/ > Ericka, Elfanie, anyone else with sources/thoughts on this? When is > the most optimal time to have the PKU test done on a newborn? I know [quoted text clipped - 18 lines] > -Sara:) > Mommy to one lovely daughter and her baby sibling, due in 14 weeks! |
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