Fetal Growth Measurements and Fundal Height

Questions and Answers

What does the FHt measurement in Haase’s formula represent?

Total gestation weight in kilograms

Fetal age in weeks

Fetal head to heel length in centimeters (correct)

Fetal height in grams

In estimating the age of gestation using the formula provided, what is the formula for age in months?

Months² (correct)

FHt in cm x 8/7

Months/7

FHt in cm x 2/7

If a mother visits on August 15 and her last menstrual period (LMP) was April 27, how many days has she been pregnant?

75 days

112 days (correct)

90 days

85 days

Which method is recommended for estimating fetal weight accurately?

Manual calculations Signup and view all the answers

How do you convert the estimated age of gestation from months to weeks?

Multiply months by 5 Signup and view all the answers

If Naegele's Rule is used, what is the primary goal of the calculation?

To estimate the due date Signup and view all the answers

What total does 6 months squared equal, as per the estimation for age of gestation?

36 cm Signup and view all the answers

What is the outcome of using Johnson's Rule for calculating fetal age from the LMP given the days completed?

It calculates weeks, which becomes part of age estimation Signup and view all the answers

What is the purpose of adding 9 months and 7 days to the first day of a woman's last menstrual period (LMP)?

To calculate the expected date of delivery (EDD) Signup and view all the answers

If a woman's LMP was on January 22, 2020, what is her expected date of delivery (EDD)?

October 29, 2020 Signup and view all the answers

Which of the following factors can be confirmed using an ultrasound during pregnancy?

Presence and location of amniotic fluid Signup and view all the answers

What is a normal fetal movement rate during the third trimester?

What determines fetal maturity during pregnancy?

Fetal position and presence of certain indicators Signup and view all the answers

What additional factor should be considered when calculating the due date from LMP?

The length of the menstrual cycle Signup and view all the answers

What is the typical increase in blood volume during pregnancy known as?

Hemodilution Signup and view all the answers

What does the sphingomyelin/lecithin ratio in amniotic fluid indicate?

The maturity of the fetal lungs Signup and view all the answers

What is the first step in calculating the Estimated Date of Delivery (EDD) using Naegele’s Rule?

Subtract 3 months from the month of LMP Signup and view all the answers

Using Naegele's Rule, if a woman's LMP is June 10, 2020, what is her Estimated Due Date (EDD)?

March 17, 2021 Signup and view all the answers

If a woman's LMP is in the month of January, which formula should be used for calculating the EDD?

+9 + 7 Signup and view all the answers

After applying Naegele's Rule, what is added to the day to finalize the EDD?

Add 7 days Signup and view all the answers

If a woman's LMP is September 5, 2020, what would be the correct calculation for her EDD?

June 12, 2021 Signup and view all the answers

What does a fundal height measurement of cm minus 12 signify in the EDD calculation formula?

Fetal weight estimate in grams Signup and view all the answers

In which months should the alternate formula for EDD calculation from January to March be applied?

January to March Signup and view all the answers

What is the significance of the terms 'primigravida' in relation to Naegele's Rule?

It refers to a woman expecting her first child. Signup and view all the answers

Study Notes

Estimating Weight and Gestational Age

Estimating fetal weight can be calculated using fundal height measurements in centimeters, adjusted with a formula: est. weight (grams) = (fundal height in cm - 12) × 155.
Determine Estimated Due Date (EDD) using Naegele’s Rule: EDD = (LMP - 3 months) + 7 days + 1 year.

Calculation Example

For a LMP of June 10, 2020:
- Adjust month: June 10 becomes March 10.
- Add 7 days: March 10 + 7 = March 17.
- Add 1 year: 2020 + 1 = 2021.
- Resulting EDD: March 17, 2021.

Quickening and Fetal Movements

Fetal movements can be measured in kick counts per hour; a typical range is 5-10 times/hour, indicating fetal health.
“Quickening” refers to the first noticeable fetal movements and is a significant milestone in pregnancy.

Additional Formulas and Measurements

Haase’s Rule estimates fetal length using fundal height (FHr) as: FHr in cm × (8/7).
Age of Gestation (AOG) in weeks can also be derived from conditions such as:
- AOG in weeks = fundal height in cm
- AOG in months = (FHr in cm × 2) / 7.

Clinical Visit Calculation

If a pregnant woman has a LMP of August 27 and visits on August 15, calculate gestational age:
- 5 months squared results in an approximate fundal height measurement of 25 cm.

LMP Calculation Examples

For a LMP on April 27 with a visit on August 15, the weight can be calculated using:
- N + (number of months passed till visit) = X/7.

Ultrasound and Pregnancy Monitoring

Ultrasound is crucial for diagnosing pregnancy, identifying fetal position, and detecting abnormalities in fetal growth or development.
Sphingomyelin and Lecithin ratios are indicators of amniotic fluid adequacy and fetal maturity.

Common Pregnancy Metrics

A normal peak fetal heart rate ranges from 120 to 160 beats per minute.
Blood volume alterations during pregnancy lead to hemodilution and physiological anemia, which are typically expected changes.

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Description

This quiz covers the calculations and evaluations related to fetal growth measurements, specifically focusing on understanding station fundal height in centimeters over different trimesters. It is designed to help students familiarize themselves with key concepts related to fetal development over a 110-day period.