A maternity nurse must be aware that screening for diabetes mellitus in pregnancy is done at?

NCL (MP) Nursing Officer - 2019

Obstetrics & Gynaecology

Easy

Appeared in: NCL (MP) Nursing Officer - 2019

Explanation

Routine screening for gestational diabetes mellitus (GDM) is a standard component of prenatal care for all pregnant women.
The optimal window for this screening is between 24 and 28 weeks of gestation.
This timing is physiologically based on the peak of insulin resistance caused by placental hormones like human placental lactogen (hPL), cortisol, and progesterone.
Screening during this period provides the highest sensitivity for detecting GDM, which might not be apparent earlier in the pregnancy.

Option A: This timeframe is too early for routine, universal screening as maternal insulin resistance has not yet peaked. A negative result at this stage would not rule out GDM developing later.
Option B: Screening between 18 and 23 weeks is still considered early for the general pregnant population. The levels of insulin-antagonistic hormones are still rising, and testing at this point could miss cases of GDM, leading to false-negative results.
Option D: This is not a standard screening window. Screening at 29 weeks or later is considered late, as it delays diagnosis and the implementation of crucial management strategies (like diet, exercise, or medication) needed to control blood glucose and prevent maternal and fetal complications.

Clinical Relevance

Nursing practice connection: Knowing Timing of Gestational Diabetes Mellitus (GDM) Screening helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Timely screening and diagnosis of GDM are critical for preventing adverse outcomes. Uncontrolled GDM increases the risk of fetal macrosomia (excessive birth weight), shoulder dystocia, birth injuries, neonatal hypoglycemia, and maternal preeclampsia.
Nurses play a key role in educating patients about the importance of GDM screening, explaining the test procedure (e.g., fasting requirements for an OGTT), and providing support and education if a diagnosis is made.
What if? If a patient has a history of GDM in a previous pregnancy, she is at high risk for recurrence. Screening should be performed at the first prenatal visit. If the initial screening is negative, it should be repeated at the standard 24-28 week window.

How to Approach the Question

Identify the core of the question: It asks for the standard timing of diabetes screening in pregnancy.
Recognize this as a factual recall question based on established clinical guidelines.
Recall the physiology of pregnancy: Placental hormones that interfere with insulin action peak in the mid-to-late second trimester.
Connect this physiological peak to the optimal screening window. The goal is to test when the condition is most likely to be detectable.
Evaluate the options based on this knowledge. 6-17 weeks is too early for routine screening. 18-23 weeks is also early. 29 weeks is too late.
Select the 24-28 week option as it aligns with the peak of insulin resistance, making it the standard of care for GDM screening.

Concept Tested & Keywords

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E6 Obstetrics Williams p. 78-90