Question:
A woman at her first antenatal visit reports LMP 2 months ago. Which ultrasound parameter is most accurate for dating pregnancy at this stage?
A woman at her first antenatal visit reports LMP 2 months ago. Which ultrasound parameter is most accurate for dating pregnancy at this stage?
Show Hint
First trimester pregnancy dating = CRL. Second trimester dating commonly uses BPD, HC, AC, and FL.
Updated On: May 14, 2026
- Biparietal diameter
- Mean gestational sac diameter
- Abdominal circumference
- Crown-rump length
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Crown-rump length is the most accurate ultrasound parameter for dating pregnancy in the first trimester.
Step 1: Identify gestational age.
LMP 2 months ago means approximately: \[ 8 \text{ weeks gestation} \] This is the first trimester.
Step 2: Recall the best dating parameter.
In the first trimester, the most accurate parameter is: \[ \text{Crown-rump length} \]
Step 3: Compare with other parameters.
Biparietal diameter and abdominal circumference are more useful in later pregnancy. Mean gestational sac diameter is useful very early, but CRL is more accurate once the embryo is visible. Therefore, the correct answer is Crown-rump length.
Step 1: Identify gestational age.
LMP 2 months ago means approximately: \[ 8 \text{ weeks gestation} \] This is the first trimester.
Step 2: Recall the best dating parameter.
In the first trimester, the most accurate parameter is: \[ \text{Crown-rump length} \]
Step 3: Compare with other parameters.
Biparietal diameter and abdominal circumference are more useful in later pregnancy. Mean gestational sac diameter is useful very early, but CRL is more accurate once the embryo is visible. Therefore, the correct answer is Crown-rump length.
Was this answer helpful?
0
0
Top NEET PG Radiodiagnosis and Radiotherapy Questions
- A 2-month-old infant is brought to the OPD with a parietal swelling present since birth. The X-ray image is given below. What could be the probable diagnosis?
- A patient presented with abdominal pain and sterile pyuria, and the x-ray showed the following features. What is the likely diagnosis?
- A woman with endometrial carcinoma is undergoing radiotherapy. Which of the following is true?
- A patient presents with a history of fever and cough for the past 3-5 days. His examination findings reveal crepitations. Chest X-ray is given below. What is the probable diagnosis?
- True about treatment of early breast carcinoma?
View More Questions
Top NEET PG Imaging techniques Questions
- A patient presented with history of diplopia and restricted eye movements. A clinical image and CT image is shown below. What will be the diagnosis?
- Identify the condition in the below image?
- A patient is a known case of acute pancreatitis develops breathlessness, bilateral basal crepitation on day 4 and chest radiography as shown in the image below. What will be the diagnosis?
- Caldwell’s view is used for:
- Dye used in diagnosis of esophageal perforation:
View More Questions
Top NEET PG Questions
- A patient hailing from Delhi presents with fever, arthralgia, and extensive petechial rash for 3 days. Lab investigations revealed a hemoglobin of 9 g/ dL, a white blood cell count of 9000 cells/mm3, a platelet count of 20000 cells/mm3, and a prolonged bleeding time. The clotting time was normal. What is the most likely diagnosis?
- Which of the following statements is true about Trichomonas vaginalis?
- A lady from West Rajasthan presented with an ulcer surrounded by erythema on the right leg. Microscopy of the biopsy from the edge of the ulcer showed organisms with dark staining nuclei and kinetoplast. What is the most likely causative agent?
- A child presents with a fever and a rash. Urine examination showed cells with owl's eye appearance. What is the most likely diagnosis?
- Infection with Clonorchis sinensis is associated with an increased risk of__?
View More Questions