PKU testing

  1. I am alittle confussed after talking to a friend of mine in California. They do their PKU's after 12 hours of age. Many of their patients go home prior to 24 hours and C-sections go home in 2-3 days. In the hospital where I work we cannot do the PKU until at least 24 hours from the time of the first feeding. I am interested to see what other peoples standard is. I thought it was a national standard.
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    About doglover21

    Joined: Feb '07; Posts: 8
    RN
    Specialty: OB/GYN

    30 Comments

  3. by   Spidey's mom
    At the very least 12 hours . . . but it can be after.

    steph
  4. by   SteveNNP
    We do ours after a minimum of 24 hours of feeds or TPN/ IVF containing proteins.
  5. by   JenTheRN
    Our state laws (Michigan) say that newborns must be tested between 24 and 36 hours. They can be tested earlier, but they will need to be retested once they are over 24-36 hours.

    I would think that this would be a nation-wide policy. Some of the things they are testing for (ie thyroid) will be different in the same newborn when they are 12 hours old verses 24 hours old.
  6. by   nurturing_angel
    We don't do our PKU testing until baby is between 48-72 hours old. Been the same at every hospital I have worked in the state of Indiana. I think its state law here but maybe its not. We don't dare do it at 12 hours. Hmmmm....
  7. by   nurseob7
    We must wait a minimum of 24 hours from birth (Illinois hospital)
  8. by   Spidey's mom
    We also will ask the parents who go home prior to 24 hours that they can come back to the lab the next day but this is dangerous as alot of people don't follow up.

    Our goal is 24 hours but if they are going home and it has been 12 hours, the lab will do it.

    I've found that labs are different . . .

    steph
  9. by   mellyt
    I dont work in OB but I can tell you that when my sons were born they did 1 PKU around 12 hours and then another after 24 hours.
  10. by   Omomo-Don
    Babies should be drinking breast milk or formula for 24 hours before the blood sample is taken. PKU test results are more likely to be correct if the blood sample is taken after the baby has been drinking milk or formula for at least 48 hours.
    If the baby is older than 6 weeks, he or she will have a PKU urine test. You do not need to do anything before the baby has this test.
  11. by   Jolie
    We had a number of early DC patients who went home prior to 24 hours of age. We did the initial PKU immediately prior to DC, and sent it to the state marked "Repeat Needed". Most parents were responsible and returned to the hospital lab for a repeat in the next few days, but if not, the State assisted us in following-up with those parents.
  12. by   DebblesRN
    How interesting to see how other states do things!!

    I live in Florida, we do our PKU's at 48 hours of age. The hospitals in our county do them before the baby is discharged, and as long as it is before discharge, they are pretty lax about when it gets done. It doesn't have to be done right at 48 hrs. At the earliest with all of our pediatricians except for one group, it gets done at 48 hrs.

    The one group that is the exception likes theirs done at 24 hours, then they repeat a PKU in their office when the baby is 5 days old. Not sure what the rationale for that is, but we comply with their wishes.

    Those of you that get the PKU's at 12 and 24 hours, I am curious, what is the reasoning for getting them so early?? I am just asking, because I don't know. I was always told that PKU's should be done after a minimum of 24 hours of protein feedings because the metabolic disorders that are being tested for show up best after at least 24 hours of protein feedings.

    Thanks for your answers in advance.

    I have to say, I absolutely LOVE this website. I learn so much from all of you ladies and gentlemen, and it is wonderful to know when I have a question about something, I can come here, and someone can help me with the answers!!
  13. by   Spidey's mom
    My assumption is the docs do a follow-up test in the office.

    We usually keep a mom/babe 24 hours but sometimes they go home earlier. I don't like it.

    steph
  14. by   Justhere
    At our hospital we do them after 24 hours of age. For those that have them done earlier because they insist on leaving before 24 hours then they have to come back for a second test. By reading the PKU slip in our state it states any time after 24 hours, but they don't like them earlier than that.

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