Ultrasound

Hi all...
I was wondering what calculation people are using to estimate gestational age based upon CRL.  We are currently using Hadlock 1992 - however are running into some issues with the GA calculation in the 80-84 mm range - as a CRL of 84 mm is generating a GA of 14 2/7 weeks.  This has implications re: GA assignments for NT and subsequent billing (e.g., CRL 84 mm >> 14+ week gestation, which now makes it a 2nd trimester study).  Does anyone know what equation they used when they developed the NT protocols? - since 84 mm is supposed to correlate to 13 6/7 weeks from what we've been told.
Thanks!

------------------------------
Thomas Lee, MD MBA
SMFM Practice Management Division - Chairperson
SMFM Clinical Informatics Committee - Ultrasound Subgroup Lead
Northwest Perinatal Center / Women's Healthcare Associates, LLC - Portland, OR
------------------------------

Hello all,
We are equally experiencing the same problem at our ultrasound unit and would appreciate if any one with the answer to the problem can share with the group

Thank you.

Izuka Rice

------------------------------
Izuka Udom-Rice
------------------------------

Original Message:
Sent: 05-05-2021 18:34
From: Thomas Lee
Subject: First trimester CRL equation for gestational age

Hi all...
I was wondering what calculation people are using to estimate gestational age based upon CRL.  We are currently using Hadlock 1992 - however are running into some issues with the GA calculation in the 80-84 mm range - as a CRL of 84 mm is generating a GA of 14 2/7 weeks.  This has implications re: GA assignments for NT and subsequent billing (e.g., CRL 84 mm >> 14+ week gestation, which now makes it a 2nd trimester study).  Does anyone know what equation they used when they developed the NT protocols? - since 84 mm is supposed to correlate to 13 6/7 weeks from what we've been told.
Thanks!

------------------------------
Thomas Lee, MD MBA
SMFM Practice Management Division - Chairperson
SMFM Clinical Informatics Committee - Ultrasound Subgroup Lead
Northwest Perinatal Center / Women's Healthcare Associates, LLC - Portland, OR
------------------------------

Try using Kypros Nicolaides CRL graphs, I think they are different than Hadlock.
There may be some others built into your ultrasound package. I know GE has some different ones.
I will look at the graphs on Monday when I am back at work to share the others.

------------------------------
Kathleen Bradley MD
MFM
Private practice
Westlake Village, CA
------------------------------

Original Message:
Sent: 05-06-2021 22:04
From: Izuka Udom-Rice
Subject: First trimester CRL equation for gestational age

Hello all,
We are equally experiencing the same problem at our ultrasound unit and would appreciate if any one with the answer to the problem can share with the group

Thank you.

Izuka Rice

------------------------------
Izuka Udom-Rice

Original Message:
Sent: 05-05-2021 18:34
From: Thomas Lee
Subject: First trimester CRL equation for gestational age

Hi all...
I was wondering what calculation people are using to estimate gestational age based upon CRL.  We are currently using Hadlock 1992 - however are running into some issues with the GA calculation in the 80-84 mm range - as a CRL of 84 mm is generating a GA of 14 2/7 weeks.  This has implications re: GA assignments for NT and subsequent billing (e.g., CRL 84 mm >> 14+ week gestation, which now makes it a 2nd trimester study).  Does anyone know what equation they used when they developed the NT protocols? - since 84 mm is supposed to correlate to 13 6/7 weeks from what we've been told.
Thanks!

------------------------------
Thomas Lee, MD MBA
SMFM Practice Management Division - Chairperson
SMFM Clinical Informatics Committee - Ultrasound Subgroup Lead
Northwest Perinatal Center / Women's Healthcare Associates, LLC - Portland, OR
------------------------------

https://www.google.com/url?q=https://www.bmus.org/static/uploads/resources/Aug_2009_Fetal_Measurements_D3NApK5.pdf&sa=U&ved=2ahUKEwj2nKHd3rjwAhUDXa0KHYhRCFIQFjAQegQIBhAB&usg=AOvVaw0stV9ha71l0zECH7wB6GKh

------------------------------
Kathleen Bradley MD
MFM
Private practice
Westlake Village, CA
------------------------------

Original Message:
Sent: 05-07-2021 19:36
From: Kathleen Bradley
Subject: First trimester CRL equation for gestational age

Try using Kypros Nicolaides CRL graphs, I think they are different than Hadlock.
There may be some others built into your ultrasound package. I know GE has some different ones.
I will look at the graphs on Monday when I am back at work to share the others.

------------------------------
Kathleen Bradley MD
MFM
Private practice
Westlake Village, CA

Original Message:
Sent: 05-06-2021 22:04
From: Izuka Udom-Rice
Subject: First trimester CRL equation for gestational age

Hello all,
We are equally experiencing the same problem at our ultrasound unit and would appreciate if any one with the answer to the problem can share with the group

Thank you.

Izuka Rice

------------------------------
Izuka Udom-Rice

Original Message:
Sent: 05-05-2021 18:34
From: Thomas Lee
Subject: First trimester CRL equation for gestational age

Hi all...
I was wondering what calculation people are using to estimate gestational age based upon CRL.  We are currently using Hadlock 1992 - however are running into some issues with the GA calculation in the 80-84 mm range - as a CRL of 84 mm is generating a GA of 14 2/7 weeks.  This has implications re: GA assignments for NT and subsequent billing (e.g., CRL 84 mm >> 14+ week gestation, which now makes it a 2nd trimester study).  Does anyone know what equation they used when they developed the NT protocols? - since 84 mm is supposed to correlate to 13 6/7 weeks from what we've been told.
Thanks!

------------------------------
Thomas Lee, MD MBA
SMFM Practice Management Division - Chairperson
SMFM Clinical Informatics Committee - Ultrasound Subgroup Lead
Northwest Perinatal Center / Women's Healthcare Associates, LLC - Portland, OR
------------------------------

Here is PDF

------------------------------
Kathleen Bradley MD
MFM
Private practice
Westlake Village, CA
------------------------------

Original Message:
Sent: 05-06-2021 22:04
From: Izuka Udom-Rice
Subject: First trimester CRL equation for gestational age

Hello all,
We are equally experiencing the same problem at our ultrasound unit and would appreciate if any one with the answer to the problem can share with the group

Thank you.

Izuka Rice

------------------------------
Izuka Udom-Rice

Original Message:
Sent: 05-05-2021 18:34
From: Thomas Lee
Subject: First trimester CRL equation for gestational age

Hi all...
I was wondering what calculation people are using to estimate gestational age based upon CRL.  We are currently using Hadlock 1992 - however are running into some issues with the GA calculation in the 80-84 mm range - as a CRL of 84 mm is generating a GA of 14 2/7 weeks.  This has implications re: GA assignments for NT and subsequent billing (e.g., CRL 84 mm >> 14+ week gestation, which now makes it a 2nd trimester study).  Does anyone know what equation they used when they developed the NT protocols? - since 84 mm is supposed to correlate to 13 6/7 weeks from what we've been told.
Thanks!

------------------------------
Thomas Lee, MD MBA
SMFM Practice Management Division - Chairperson
SMFM Clinical Informatics Committee - Ultrasound Subgroup Lead
Northwest Perinatal Center / Women's Healthcare Associates, LLC - Portland, OR
------------------------------