December 21, 2009

Manual calculation of Period of Amenorrhea




Counted based on LMP, therefore must follow Nigeal’s Rule which is

1) Regular menses

2) Not on hormonal contraceptive

3) Not breast feeding.


Steps

1) Find LMP

2) Minus date of clerking with LMP

3) The months show additional day and week based on above tables

4) Change the months and day into week and then plus with additional day and week.


Examples

Date of clerking: 25/8/08

LMP: 3/4/08

POA: 4 months 22 days

4 months = + 1 week 2 days

Therefore, 4 months (16W)+ 1 week + 2days + 22 days (3W+ 1days)

= 20W+ 3days.


16 comments:

  1. salam wbt

    boleh tanye tak?
    kenapa 4 months = + 1 week 2 days?

    ReplyDelete
  2. kepada haykalis hamka

    wsalam w.b.t..

    untuk rumus ini sebenarny begini. bagi mengira POA. untuk setiap 3 bulan perlu ditambah dengan 1 minggu.

    4 bulan bersamaan dengan 3 bulan + 1 bulan

    1 bulan = (1/3 daripada 3 bulan = 2.3 hari. bila dibundarkan menjadi 2 hari)

    sama la jugak dengan 5 bulan = 3 bulan + 2 bulan

    2 bulan = (2/3 3 bulan) = 4.6 hr. dibundrkan menjadi 5 hari.

    sekian terima kasih

    ReplyDelete
  3. salam... POA tu kan, kami dapat 19/52 + 3 days... tanye kawan2 pun dapat yg same..

    ReplyDelete
  4. to lailyvia

    wsalam wbt.

    boleh saya tahu mcm mana saudari kira.. mungkin perbincangan ini dpt menguragkan keraguan kedua belah pihak.. t-q

    ReplyDelete
  5. daripada date of clerking 25/8/2008.
    LMP 3/4/2008..

    Bulan 4 ada 30 hari so sy tolak 30-3=27

    bulan 5=4 minggu
    bulan 6=4 minggu
    bulan 7=4 minggu
    total = 12 minggu

    bulan 8= 25 hari

    25+27=52 hari=7 minggu 3 hari

    so sy tambah 12 minggu + 7 minggu 3 hari = 19 minggu 3 hari

    19/52 + 3/7

    Betul tak? kalau salah mintak betulkan.. saya pun masih belajar.
    Terima kasih :)

    ReplyDelete
  6. to lailyvia

    you can calculate it manually. dah betul dah cara tu.. however you forget one important step.. utk setiap 3 bulan, you kena tambah satu minggu..

    ade explaination dia kenapa kna tambah 1 minggu for every 3 months tp sy x ingt..

    untuk confirmkan lagi, u boleh cuba guna gestational chart...

    tq

    ReplyDelete
  7. saya cm pening la cara awak kre POA nih....huhuhuhu

    ReplyDelete
  8. salam.
    sy cuma nk bg ilmu cket je.
    sy dpt ni dr MO HKL yg byk mengajar kami during posting o&g.
    to count POA:

    3 months = 13 weeks
    2 months = 8 weeks 5 days
    1 months = 4 weeks 2 days

    tp sy x tnya mcm mana dia dpt formula ni. so xle la nk tau resource nye. hope this can help u to calculate the POA..
    =)

    ReplyDelete
  9. sy 3rd yr medical student, skg posting o&g. hm, yg sy blaja plak every 2months need to add another 1week. berbeza dgn saudara yg 3months baru tmbh 1 week.

    ReplyDelete
  10. i got it..acun kte rs awk silap tgok kot..

    ReplyDelete
  11. Salam to all. :)

    I think the reason why we add 1 week for every 3 months is because Gregorian calendar says one month has 30-31 days (except Feb) or if in weeks, about 4.33 weeks.

    Sedangkan kita assume dalam normal LMP one month ada 4 weeks je. So, maknanya we have about 0.33 week ( 2-3 days) missing each month. We have to correct this loss.

    Actually this 0.33 week loss akan menjadi 1 week lepas tiga kali round, or three months (0.33 + 0.33 +0.33 = 1 week).

    Sebab tu every 3 months, kita correctkan defect tu dengan add 1 week tadi. Meaning: 4 week + 4 week +4 week +1 week = 3 months

    Allahu a'lam. Its pretty straightforward actually, I think. Correct me if I am wrong, thanks.

    ReplyDelete
  12. salam to all..

    thanks for ur enlightment.. basically answer giving by our bro zuhairi is the best berkenaan dgn tmbah hari tu..

    it's utk cukupkan hari je..

    sebenarnya kalau ikut rumus yg diberi oleh O&G specialist, utk setiap 3 bulan, perlu tambah satu minggu sahaja.. walaubagaimanapun, bila check balik, selalu ada mistake bila compare dgn gestational chart kalau x tambah utk hari tu skali.. so table kt atas tu hanya sebagai alternative la..itu pun diberi oleh seorang specialist O&G jugak

    walaubagaimanapun, mengikut kata specialist lain, kalau just nak stick to the old rule pun ok.. just tambah seminggu utk every 3 months

    thank you so much...

    ReplyDelete
  13. satu lg utk anonymous;
    3 months = 13 weeks
    2 months = 8 weeks 5 days
    1 months = 4 weeks 2 days

    sebenarnya kalau ikut table yg kat atas tu, ia akan dapat exactly spt apa yg HO tempat anonymous ajar tu...

    ReplyDelete
  14. AS`KUM. IM 3RD YEAR MED STUDENT..ITS QUITE COMPLICATED! SO CUD U COUNT D POA FR D FOLLOWING:
    -LMP:20/5/09
    -DATE OF CLERKING: 18/9/09

    PROB. IT WILL ENLIGHT ME SOON REGARDING UR METHOD
    THANX
    !

    ReplyDelete
  15. Salam.. after some revision, I found out that this method has some discrepancy with shortage of 2-3 days. Therefore, it is not suitable to be used in exam.. I will post other method later. The manual method that I learn from my friends.

    However, this method still can be used in practice to estimate the week of pregnancy. After all, the intervention for pregnant mother will include and estimation of + one week of error in calculating the POA. For example why induction of labour in diabetic mother with insulin or c-sec being planned at 38w. because after consideration of error in POA calculation. The age of baby will be at range of 37w-39w which is still in term range.

    But I will still outline the method of calculating the POA based on this method.

    Ok.. from ur question,

    LMP:20/5/09
    DATE OF CLERKING: 18/9/09

    So the period during your LMP to date of clerking would be

    20/5-20/8 = 3 months
    20/8 – 18/9 = 29 days

    So equal to 3 months (3X4w= 12w) + (7 days from the table) + 29 days (equal to 4W + 1d)

    =12W+ 1W+ 4W+ 1d= 17W +1d……… from the gestational chart, the POA would be 17W+ 3days…

    ReplyDelete

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