## **Core Concept**
Gestational hypertension, also known as pregnancy-induced hypertension, is a condition characterized by high blood pressure that develops during pregnancy. The diagnosis is primarily based on blood pressure measurements. The American College of Obstetricians and Gynecologists (ACOG) provides guidelines for the diagnosis of hypertension in pregnancy.

## **Why the Correct Answer is Right**
The correct answer, **140/90 mmHg**, is based on the ACOG guidelines, which state that hypertension in pregnancy is defined as systolic blood pressure of 140 mmHg or higher, or diastolic blood pressure of 90 mmHg or higher, on at least two occasions, at least 4 hours apart. This threshold is crucial for identifying pregnant women at risk and for initiating appropriate management to prevent complications.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because blood pressure readings below 140/90 mmHg are considered within the normal range for pregnancy.
- **Option B:** Similarly, this option suggests a threshold that is not used for the diagnosis of gestational hypertension.
- **Option D:** This option is also incorrect as it does not align with the standard criteria for diagnosing gestational hypertension.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the diagnosis of gestational hypertension requires blood pressure measurements to be elevated on at least two occasions, at least 4 hours apart. This helps differentiate transient blood pressure elevations from sustained hypertension that requires medical intervention.

## **Correct Answer:** . **140/90 mmHg**