An uncomplicated pregnant patient presents for evaluation at 28 weeks of gestation for her… — USMLE Step 2 CK

An uncomplicated pregnant patient presents for evaluation at $28$ weeks of gestation for her scheduled obstetric follow-up. The $25$ -year-old nulliparous woman reports feeling well, with only mild generalized fatigue and occasional lower back pain. She explicitly denies abdominal pain, nausea, vomiting, or skin itchiness. Her blood pressure is $112/70$ mm Hg, and her pulse is $82$ /min. Physical examination reveals a gravid uterus consistent with dates and no right upper quadrant tenderness. The skin shows no excoriations or jaundice.

Routine laboratory results are as follows:

Hemoglobin: $11.2$ $g/dL$
Platelet count: $195,000/\mu L$
Aspartate aminotransferase (AST): $24$ $U/L$
Alanine aminotransferase (ALT): $28$ $U/L$
Alkaline phosphatase: $285$ $U/L$ (Reference: $40-120$ $U/L$ )
Total bilirubin: $0.6$ $mg/dL$

Which of the following is the most appropriate next step in the management of this patient?

Continue routine prenatal careCevap
B
Order fasting serum bile acid levels
C
Obtain a right upper quadrant ultrasound
D
Initiate ursodeoxycholic acid therapy
E
Test for hepatitis viral serologies

Cevap

Continue routine prenatal care

The correct answer is to continue routine prenatal care. This patient has an isolated elevation of alkaline phosphatase (ALP) in the setting of an otherwise normal clinical presentation and normal aminotransferases (AST, ALT) and bilirubin. During pregnancy, total ALP levels naturally increase, often reaching 2 to 4 times the non-pregnant upper limit of normal by the third trimester. This is primarily due to the production of a placental isoenzyme of ALP, alongside a minor contribution from increased maternal bone turnover. Because this patient is asymptomatic (e.g., no right upper quadrant pain, no pruritus) and her other liver biochemical tests are strictly within normal limits, this finding represents a benign, physiologic change of pregnancy. No further diagnostic testing or treatment is required.

Adım Adım Çözüm

Evaluate the patient's symptoms and physical examination findings.

The patient is asymptomatic (no pruritus, no abdominal pain) with a normal physical examination.

To determine if there is any clinical evidence of true liver or biliary pathology.

Analyze the laboratory results in the context of the third trimester of pregnancy.

AST, ALT, and bilirubin are normal. Alkaline phosphatase is significantly elevated.

To differentiate between normal physiologic adaptations of pregnancy and pathological hepatic disease.

Synthesize findings to determine the next step in management.

The isolated elevated alkaline phosphatase is a normal physiologic finding due to placental production. No further workup is needed.

To avoid unnecessary testing or treatment for a normal physiologic adaptation.

Anahtar Kavram

During pregnancy, an isolated elevation in alkaline phosphatase (ALP) is a normal physiologic change caused by the placental production of the ALP isoenzyme and increased maternal bone turnover. In the absence of symptoms or other liver function abnormalities, it requires no intervention.

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Cevap

Adım Adım Çözüm

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